computer restarts when i turn it on

The "stop 0x0000001" error may (in some cases and not necessarily yours) relate to "Win32k.sys driver"

Microsoft has created a "patch" to resolve problems related to Win32k.sys driver.
You may resolve your problem by going to MS Updates to get any critical updates and patches.

(It is always a good idea to keep your XP Operating System up to date)
I realize that MS periodically creates a mess for some users with their monthly updates. Still they usually catch the problems and create additional patches to resolve them. To the best of my knowledge at this time, the MS Update critical updates and patches have been successfully resolved and are not creating any new problems for XP users.

Have you updated your XP installation, since installation?
Go get the current updates and patches manually, here:
http://v4.windowsupdate.microsoft.com/en/default.asp
Does that resolve your problem?

After getting the MS Updates, there are a couple of additional things to consider.

1. Your Drive F:\ is reportedly almost full.
Since you use that Drive for "DOWNLOADS" it is "relatively less likely" that a full disk would create big problems for you if the Drive is simply for "saved files". However, if some of those "DOWNLOADS" are Applications and Processes that Run active, or which you occasionally run manually, they may need extra room on Drive F:\ to fully elaborate, consuming more space and maybe not having enough space to actually run without creating Errors. 4500 MB (8%) of Drive F:\ is still a lot of space … 4 1/2gigs, but we don’t know how fragmented that Drive is.
(Suggestions for Repair are below.)

2. You may be experiencing "faults" (actual physical problems) on one or more of your Drives
Having "faults" on a Drive does not mean that the Drive is totally ruined. Actually all Hard Drives have "faults" even when brand new from the manufacturer. Your Operating System has mechanisms to detect faults and remember a map of your Hard Drives so that no attempts are made to read from or write to the "fault" location. Like I said above, this is a normal situation, but as your machine uses more and more of a Hard Drive, it may discover additional faults that have not yet been catalogued.
(Suggestions for Repair below)

3. You “may” have a problem related to your BIOS. (Since BIOS is foundational to the functioning of your machine, much caution must be used when considering changes.) I very rarely find it necessary to attempt changes (Flashing the BIOS). Errors made in flashing the machine's BIOS can render the machine absolutely dysfunctional. Therefore, "flashing the BIOS" is not a routine maintenance function. Even for those who have a BIOS for which there have been upgrades, it is usually better to keep the original BIOS as long as the machine is functioning properly. (Flashing the BIOS is an extreme example of "If it ain't broke, don't be fixin' on it) So we will leave this item until all other paths are exhausted.
As dreadful as the above sounds, there are many known-good avenue of repair, even recovery from a bad flashing. But on to other things first.
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Per #1 above:

First:
Seriously consider what you can backup to CD from your F:\ Drive.
Attempt to backup and save files to CD with a goal to get close to 25% free space on Drive F:\

Secondt:
To clean up junk files on your various Drives:
Start – Run –(type)cleanmgr.exe – Enter
This gives you the MS resident cleanup tool, with options to select to run it on each of the lettered Drives separately.
In sequence, starting with C:\ and proceeding through to F:\ …. Run cleanmgr.exe on each of your Drives.
For a comprehensive manual step-by-step procedure to delete all of the junk files on any Drive follow the procedure in “quotation” at the end of this post.

Third: Run your Disk Defragmenter on each of your Drives
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Per #2 above:

Set the order to boot from the CD Rom 1st and the Hard drive 2nd.

Put your Windows CD in the tray, then "Exit with Saving" the settings (far right tab)

1. Boot with your windows CD
It will take some time as the CD loads various files

2. Type R to Enter the Recovery Console
3. Enter the Administrator password (if there is one)
4. Type: chkdsk c: /r and press Enter << 5. Once completed, enter chkdsk d: /r — and in succession with e: and f: to include all your drives.
6. Repeat steps 4 and 5 above, using the paramet /f – scan all of your Hard Drives

chkdsk /r - Locates bad sectors and recovers readable information on each drive

chkdsk /f - Fixes errors on the disk

Some experts have argued that running both chkdsk /r and chkdsk /f is redundant.
Their rationale is (in general terms) that elements of ( /r) and ( /f) run when either /r or /f parameter are specified.
That is probably not completely true, so please consider running chkdsk on all drives with /r and then again with /f.
Comment:
Chkdsk (CHECKDISK) is a very “time-consuming” process. (estimate 20-30 minutes for a 40gb Hard Drive on a fast (7200rpm drive) up to 1 hour on a slow (4200rpm drive).
Comment:
Running Chkdsk from Recovery Console insures that no other Windows or Applications start running active in any way that would interfere with chkdsk.
Do not enter any keyboard or mouse commands while chkdsk is running.
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Per #3 above:

Before even considering any work on the BIOS, let’s hope that the previous routines are successful in repairing your problem.

After you have completed the above sequence of repairs, let us know how your machine is running.
I will be consulting with other more knowledgeable helpers prior to making any recommendations regarding Flashing the BIOS.
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About your most recently posted problem:

STOP: c000021a {Fatal System Error}
The windows logon process system process terminated unexpectedly with a status of 0xc0000005(0x00000000 0x00000000).
The system has been shut down.

0xC000021A: STATUS_SYSTEM_PROCESS_TERMINATED
(Click to consult the online Win XP Resource Kit article, or see Windows 2000 Professional Resource Kit, p. 1561.)
This occurs when Windows switches into kernel mode and a user-mode subsystem, such as Winlogon or the Client Server Runtime Subsystem (CSRSS), is compromised and security can no longer be guaranteed. Because Win XP can’t run without Winlogon or CSRSS, this is one of the few situations where the failure of a user-mode service can cause the system to stop responding. This Stop message also can occur when the computer is restarted after a system administrator has modified permissions so that the SYSTEM account no longer has adequate permissions to access system files and folders

.

To the best of my knowledge, this error has been corrected for in “critical updates and patches” from Microsoft.
Therefore it should have been corrected when you updated per instructions earlier in this post.
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Similarly, your problem with installing Flash,
The Microsoft installation engine utility has been upgraded/patched in the regular critical updates and patches.

When I install FlashPlayer, (to display animations) I go here:
http://www.adobe.com/shockwave/download/in…=ShockwaveFlash

If you are installing a utility to “create” animations, we would have to know exactly what utility it is that you are attempting to install and where you are downloading if from.
Since I have no great knowledge of such utilities, you may want to open a New Topic, unless the “MS updates” have solved your problem.

Best Regards

Here's the complet "manual" procedure for removing junk files from your Hard Drives.
Apply the steps to each of your drive letters C:\, D:\, E:\, F:\. as appropriate.

QUOTE
Here's a complete routine to manually do that:
To clean out all the temporary files and cookies on your system.
Go to
Start - Run - (type) "cleanmgr" without the quotes.
Let it scan your system for files to remove.
Check these three boxes and then press ok to remove:
Temporary Files,
Temporary Internet Files,
Recycle Bin.

Then GoTo:
Start - Find/search - Files or folders - in the named box, type: *.tmp
When the list is generated, choose
Edit - select all - File - delete.

Note: If you cannot delete them all at once because you have too many, then click and hold ctrl and highlight a batch of them at a time. Once highlighted, R-click over the highlight and select delete.

Then use
Start - Run - (type) "%temp%" (without the quotes).
Delete the entire contents of that "temp" folder
(use Edit - Select All - press "Delete", click "Yes").

Then,
Empty your Temporary Internet Cache completely.
Close all instances of Outlook and Internet Explorer,
then use "Control Panel - Internet Options - General tab and click the "Delete File" button.
When prompted place a check in: "Delete all offline content", then click OK.

Then, use Windows Explorer to clean out ALL the other temp folders on your system
(navigate to the folder, (as listed below)
use "Edit - Select All", press "Delete", click "Yes"

* C:\Documents and Settings\\Local Settings\Temp\
* C:\Documents and Settings\\Local Settings\Temporary Internet Files\
* C:\Documents and Settings\\Local Settings\Temp\

* C:\Windows\Prefetch\

* Empty your "Recycle Bin".

Note: This is a long manual way to clear out .tmp files. It is safe and highly recommended.

Eventually you may wish to use a "tool" to do this procedure for you on a regular basis.
Download: CleanUp! 4.50 from http://www.stevengould.org
Read about all the options for using this device and use it only after you are satisfied that you understand what it will do for you. I use it regularly, and have a squeaky clean computer as a result. I recommend the default setting that are set during installation.


After doing the above routines, do this separate cleaning of your ActiveX, applets and Java routines:
GoTo:
Control Panel - JAVA - (this will open your JAVA Control Panel)
(in some cases the steps might be Control Panel - JAVA plugins)

Once your JAVA Control Panel is open, you will see a Button down toward the bottom of that panel labeled "Delete Files"
Click - Delete Files - OK, Then close your JAVA Control Panel and Reboot.

Note: The current version of JAVA Runtime Environment is Version 8. If you are running an older version, there are specific "vulnerabilities" that have corrected in Version 8. Recommended: Use Add/Remove to "completely" uninstall your Current JAVA Runtime Environment. Then go to C:\Program Files and Delete the entire Folder of JAVA. Then install the newest version of JAVA Runtime Environment. Get it here:
http://www.java.com/en/download/manual.jsp

Please note that in doing the above routines, you will "lose" any auto-login settings that Window has saved for you regarding Websites that you visit that require Username and Password to access the site, and any ActiveX scripts necessary to interact with the Website.

This is not a problem, since you will merely be required to "re-enter" your Username and Password the next time you visit any such site. (for instance, Here at TomCoyote) Or you will be asked to download a fresh copy of any required ActiveX. After that, Windows will again remember the settings for you and you will be able to auto-login again.

It's a good idea to clear up these features on a fairly regular basis, for a couple of reasons. First, ActiveX and applet routines occasionally become corrupted and can be infected with some malwares. Second, temporary internet files are often the first entry point of spyware/malware.