Goto "setting" / "control panel"
From the "control panel" start "system"
A small window will appear with four tabs at the top labeled "general", "device manager", "hardware profiles", and "performance".
Goto "performance" and click on the "file system" button. You'll see a new window with 5 tabs across the top. Last on is "troubleshoot".
Goto "troubleshoot" and a list of checkboxes will appear. Last one is "disable system restore".
Keep clicking OK until you've closed all the windows, and then "restart" your computer.
Go back in when you are done and re-enable the system restore.