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@Andre. Hey man that Vista hard drive crap drove me crazy too, Vista has this retarded extra restore point system, whereby it constantly makes extra copies of your essential files whenever something big happens to your computer. But then it keeps EVERY RESTORE POINT IT MAKES, taking up more and more of your hard disk, and this doesn't show up anywhere. Torrents trigger it like crazy too. You can easily clear the restore point cache, go to Control Panel/System and Maintenance/Performance Information and Tools/Open Disc Cleanup then More Options tab, then clean up system restore and shadow copies. You should get a whole heap of hard drive back. There's a way to turn the whole process off, but I can't remember how I did it, and I just hit that clean up button every couple of days for a while. Hope that helps.
Solve all your Vista problems in one fell swoop - install XP.