|Most Virus and Spyware scans are likely to work better in Windows Safe-Mode.|
Try this, that includes removing System Restore Restore Points
except the latest. If your computer is on all day every day, then S.R. will make a Restore Point every day.
Description of the Disk Cleanup Tool in Windows XP
Another thing I notice that is taking up space is
EVENT VIEWER logs. Go into Event Viewer then right click
each catagory (System, Security, and Application),
then click "Clear all events".
When Prompted to Save, do not save.
Also check all the files in
The Prefetch folder is quite large.
I have deleted all files there, even
Layout.ini, at times without problems.
It will rebuild itself over time.