Bottom Line — It seriously looks like it's time to add a second Hard Drive and move many of your games and applications out of your C:\ drive and onto your new second drive.
The Disk CleanUp utility feature -
Compress Old Files, is safe and may save you some room, even as much as one gigabit, but that really won't completely solve your Full Hard Drive problem. "Compress Old Files" will notice any applications you haven't used in the past 50 days (or some other arbitrary number of unused days) When you return to use applications that have been compressed, your XP system will automatically Uncompress them before use. This "uncompress" procedure will take a small amount of time, and you may experience "lag" while the computer is uncompressing. This is usually not a problem, but if you are an agressive "gamer" you may be sensitive to any "lag" whenever and however it appears.
CleanUp! 4.0 or 4.5 from www.stevengould.org is a great program. That's probably the utility that you mention that you used. It does pretty much the same function as the XP Disk CleanUp, but I think it does a much better job. (notice that the XP Disk CleanUp window already shows 0kb to Temp and Recycle Bin.
You can retrieve even more Disk space by using the "More Options" tab in XP's Disk CleanUp.
Press the More Options tab and you will get options to remove old Restore Points (eventualy System Restore can consume a Huge amount of space saving mostly uselesss old system configuration information that you'll never use) I think the default setting is 12%. That would mean about 10 gigabits on an 80gig hard drive. That's some serious space. Users generally only need the most recent few Restore Points and can save a ton of Hard Drive space in this feature.
Again, under "More Options" you have the alternative of removing XP system functions that you don't use. Unless you actually know that a feature is unused - and un-needed by XP - leave it alone.
Never turn off System Restore Points if your machine is infected with spyware or virus, until you've completely cleaned the infection. (Having even an infected Restore Point, is better than No Restore Point at all.)
Clear out your
Restore Points "manually" as follows:
System Restore: turning it off and back on
On the Desktop, right-click My Computer.
Click Properties.
Click the System Restore tab.
Place a Check in - Turn off System Restore.
Click Apply, and then click OK.
Now Turn your System Restore back on:
Restart your computer.
On the Desktop, right-click My Computer.
Click Properties.
Click the System Restore tab.
Remove the Check mark from - Turn Off System Restore.
Click Apply, and then click OK.
While in your System Restore, you could consider adjusting the default setting downward from 12% to 6% or even 3%. Those settings will still give you room for several Restore Points, while not consuming the extra 5gigs or more of your Hard Drive.
Downloaded Program Files in C:\Windows\Downloaded Program Files —
These are not "installed" applications, but rather the installation routines themselves.
You can generally, safely delete these files.
Click on each one to "see what it is". And make a decision about whether or not you want to install them.
Recycler - When you delete a file, it goes to the Recycle Bin. When you Empty Recycle Bin, XP pushes the file information to Recycler. Only the computer spirits know why you would want to save stuff that you already deleted twice. But XP has these redundant safeguard to prevent you from losing files that you might have deleted by accident. If your machine has been running just fine for a week or so after deleting a file to the Recycle Bin, and then to the Recycler……. you can probably dump them for good.
Select the entire file/s in Recycler and delete it/them
Back to my original Bottom Line……… Going through the steps I have listed above, will probably gain you up to 10gigs at most. Windows XP and your "gaming applications" needs "Free Space" when activated during system procedures and game playing. The general "Rule of Thumb" is to keep AT LEAST 25% free space on a Hard Drive for good performance.
Therefore, please consider getting a second Hard Drive and moving your gaming applications over to it.
Added Benefit - With more "Free Space" your XP and gaming applications will have more room to operate and you will probably notice an increase in Performance.
Best Regards