With hardware prices going down every passing day You may not need this tip but if You are in a situation where You are really low on disk space even after using disk cleaner, one of the things You can do is to identify features of XP You don't use. It may very well be the hibernate feature. If You don't use it, simply disable it and get as much of hard disk space free as is your physical RAM size. To do that go to power options in control panel (fast route: goto START-RUN or win+R and type powercfg.cpl ) and click on hibernate tab and deselect "enable hibernation".