crashes while watching videos and flash based pages

Hi Alex,

You have some work to do.
But it is uncertain from my point of view which if any of the items to be addressed may help in correcting your stated problem of crashes during viewing of flash video. Taken as a whole, the recommendations below will potentially improve the performance of your machine. However, if specific damage from surge has occurred to your motherboard chipsets and/or the AGP Slot or other MB printed circuitry, or your PSU, you may still be in need of Hardware repair/replacement.

Temperatures and Voltages:

As expected, there are some variances indicated that could be contributing to the problem

CPU temp 60*C is too high in my opinion and general experience.
There are some folks who will say that 60* is within the range for modern CPU's.
But I'd prefer to see that number well under 35*C

I realize that it is not a "fair" comparison, but the machine that I'm presently using is running more than 20* cooler at the CPU than yours and the HSFan is only laboring at 1734rpm.
I am presently running Outlook, 4 local window utilities, realtime security, printe, and (7) open browsers with multiple tabs each and displaying multiply streaming video. <– not unusual for me, but should be at least comparable to load you are running when experiencing the video problem.

possible causes:
heatsink clogged fins or HeatSink not properly seated to CPU with adequate sealing paste
case fan not properly exhausting
Ambient room temperature extremes
excessive background applications and processes running constantly

It is also possible that Everest is not giving you precise readings.
Better readings may be available to you via BIOS/CMOS display

Voltages:
"Very Generally speaking" voltage differences of .50v difference from expected values can indicate problems with PSU
Some of your values approach this level, and some exceed it significantly.
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On the Top Of My List from your PCPitstop Full Tests

HD fragmentation:
Data Fragmentation 32% <– Yikes!
File Fragmentation: 7 percent

These values can cause excessive seek-read-write cycles and "could" be directly responsible for sound and video stuttering.

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Background processes running:
Apple iTunes Apple Inc. C:\Program Files\iTunes\iTunesHelper.exe
Realtek Sound Manager Realtek Semiconductor Corp. C:\WINDOWS\SOUNDMAN.EXE
ATI Hotkey Utility ATI Technologies Inc. C:\WINDOWS\system32\ati2evxx.exe
everest.bin Lavalys, Inc. C:\Program Files\Lavalys\EVEREST Home Edition\everest.bin
MSN Messenger Microsoft Corporation C:\Program Files\Windows Live\Messenger\msnmsgr.exe
Debugger Microsoft Corporation C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
iPod Service Apple Inc. C:\Program Files\iPod\bin\iPodService.exe

None of the above are necessary and can contribute to excessive CPU/RAM load
Recommendation: Disable them via MSCONFIG
They can be used manually if/when necessary

Speech Microsoft Corporation C:\WINDOWS\system32\ctfmon.exe
This item cftmon.exe is unlikely to be ever used, unless you do alot of translating of Thai/Mandarin translation or if you use audio activated keyboard entry (which I do not see)
Disable - cftmon.exe via Control Panel
Control Panel - Regional and Language Options
Language(tab) - Details(button)
Advanced(tab)
Put a checkmark/tick in front of "Turn off advanced text services.

I would also turn off Hyberfil.sys (Hibernate indexing)
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Are you using Internet Connection Services to connect other machines to the Internet Gateway via this computer?
If not I sure don't know why it would be running active.
Windows ICS Microsoft Corporation C:\WINDOWS\system32\alg.exe
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Services.exe can be an ordinary MS operating system feature, but is usually not running actively
Yours "may" be associated with a "backdoor-Trojan"
Service control process Microsoft Corporation C:\WINDOWS\system32\services.exe

You should Run an Online Scan such as Kaspersky or TrendMicro HouseCall <– Immediately
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Which brings me to a very important point…..

Where's your installed Antivirus and installed AntiSpyware, and to a lesser extent why is there no software Firewall?

If you are depending upon MalwareBytes on a "per use" basis, you are at risk of allowing your machine to become infected.
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You have several items of application software and fragments from apparently uninstalled applications (Norton/Symantec) that are apparently not being used and ought to be uninstalled.
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You have
Norton Antivirus 2004 (apparently not updated?) and not running active?
Spyware Doctor (excellent, but apparently not updated)
Spybot S&D (good but apparently not updated)
Ad-Aware (not much use, except in specific circumstances)
Zone Alarm from 2005 which is way out of date and vulnerable and not scanning actively?

Your JAVA Runtime Environment 5. 7 appears to be "way" out of date <– very much vulnerable to corruption

You could be dealing with a corrupted Codecs Pack.
The one you appear to have DivX was installed in 2006 and therefore "not suspect" since it apparently served your purposes for quite some time, but it could have become corrupted.

I like K-Lite Mega Codec Pack which also contains a Quicktime Alternative and RealPlayer Alternative which can be configured to run through Windows Media Player with much less impact to your machine.
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***
It is "possible" that much of your performance difficulty is due to undetected malware.
I'd certainly post a HJT over in the Malware Removal Forum for an expert opinion.
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It is "possible" that much of your performance difficulty is due to Hard Disk Fragmentation – Run your Defrag
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It is possible that much of your performance difficulty is due to damage to PSU or MotherBoard sustained during surge.

You can take remedial steps using the above as guidelines before taking the step of trial PSU replacement.

I would most Definitely post a HJT over in the Malware Removal forum.

The above is a "bunch" to consider.
Please keep us posted with your progress.

Best Regards,
Doug