Jesus-effing-A dude.
Okay, here's a quick easy way to clear some space. It's called clearing your temp folder.
The temp folder is a place where files are, as is should be hinted at, stored temporarily. If you use Firefox, and as opposed to downloading something, choose to open it, it will be saved here, so that you can access it.
Basically, you rarely need the stuff in here.
Follow these directions. Ready?
My Computer
Local Disc C:\\
Documents And Settings
Owner
Local Settings (If this is hidden, rightclick in the window, go to properties, and click/unclick 'Hidden')
Temp
Congrats! You're now in your temp folder. I can almost promise you there's a bunch of useless •••• in here from times you don't even remember.
Ctrl+A, and slam your finger on the Delete key.
Then empty your recycling bin.