For Windows XP go to START >> Accessories >> System Tools >> Disk Cleanup. Click yes.
You have deleted old temporary Internet Files.
Start Internet Explorer. Click "Tools" >> Delete History >>
check the plugins box .... click delete all.
Empty the Recycle Bin !!!
Run defrag from the XP interface.
Some files, in use like virus definitions, won't defrag.
1) Unplug from the Internet.
2) Go to Start >> RUN.
3) type MSCONFIG.
4) A window will appear. Choose minimal start up.
6) Go to Start >> Run.
7) type DEFRAG hit enter
*** You are now running the command line version of Defrag**
8) When it finishes,,, say 60 to 90 minutes,,
9) Go to Start >> Run, type Msconfig.
10) Choose normal start.
12) Plug in Internet cable.
Now EVERYTHING is defragged including virus defs etc.
Search for *.chk files, delete them all, and Empty the Recycle Bin
If you're still low on disk space get a 4 GB flash drive -- you don't have to even open the case and you can take it with you.