Right click My Computer, then click properties- click the performance tab- then click the file system tab near the bottom- then click the troubleshooting tab- place a checkmark in the heading "Disable system restore". After that it will need to reboot- that should take care of it. The next time you open up the file system tab the "system restore disk space use" slider should be grayed out meaning it is disabled.
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Wherever you go, there you are.