I've been looking on an XP machine what is using all that diskspace, and il s'avère que C:\Windows\Installer is high up there on the list of directories that use the most diskspace.
It seems to contain a cache of msi and msp files.
Est-il sûr de delete those? To save diskspace, I've been deleting the "$KB...$" directories for ages without any problems. I want my Windows Updates in my system, why you would want to uninstall them is something that J'ai never understood. (Except when you're on an update revision board professionally or something of that order.)
