[ame="http://download.cnet.com/Glary-Utilities/3000-2094_4-10508531.html?part=dl-6280556&subj=dl&tag=button"]Welcome Glary Utilities users[/ame]
Glary Utilities has a decent one click clean up thing that will delete old cache files and other misc files buried on your PC
After that if you still need room,
I'd go to start and then search and type in
*.avi
and start deleting some of my bigger AVI files. If you have a full size movie, it could easily be 1.2 gigs for one movie, Hard drive space is ridiculously cheap right now, even a USB flash drive can be gotten for $12 for 8 gb. For a 500+ gig external, about $50. I think I saw a samsung F3 1 tb drive for like $54 last week.