Have you been running Microsoft Vista for a few weeks/months and all of a sudden find out that a lot of your hard drive space is taken up for no apparent reason?
The culprit is most likely system restore.
To remove the old restore points and regain your drive space follow along:
Step 1: Click Start -> All Programs -> Accessories -> System Tools -> Disk Cleanup.
Step 2: Choose “Files from all users on this computer”

Step 3: Click “Continue” to the Vista UAC prompt
Step 4: Click the “More Options” tab
Step 5: Click the “Cleanup” button in the “System Restore and Shadow Copies” area

Step 6: Click “Delete” to the prompt that asks if you want to delete all but the last restore point.

Step 7: Then click “OK” on the previous window.
Step 8: Click “Delete Files” to the prompt below and the Disk Cleanup tool will go to work freeing your hard drive of old backup files.

That’s it. Once it finishes you will regain back a good chunk of missing hard drive space. In my case it was almost 15 GB!
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