Here are some other tips. You can move the entire My Documents to another drive. Click Start, Right Click My Documents then properties then under target Folder Location choose the new drive and folder and click move. From now on Windows will save all My Document files to the new Drive. All you old files will be there to.
Another is right click on My Computer, choose Properties then System Restore. Highlight the main drive (Ususally C) then click click Settings. You will see a slider. Slide it to the left to around 2%. Do that for each drive.
Depending on the size of your drive you may recover gigabytes of space. (Windows reserves a ridiculous 12% which would create dozens of System Restore points, most but the most recent are useless)
Also run the Windows clean up tool (Start, All Programs, Accessories, System Tools, Disk Cleanup.
Another tip is open IE choose Tools, Internet Options and under Temporary Internet Files settings reduce the space to around 200meg.
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