System Restore
The Windows operating systems provide a System Restore option which allows you to return your computer to an earlier operating state (without affecting data files) if changes to the hardware, software, or other system settings have left the computer in an undesirable operating state. Any changes that System Restore makes to your computer are completely reversible.
CAUTION: Make regular backups of your data files. System Restore does not monitor your data files or recover them.
Restoring Your Operating System
Starting System Restore
1.Click Start 
.
2.In the Start Search box, type System Restore and press <Enter>.
NOTE: The User Account Control window may appear. If you are an administrator on the computer, click Continue; otherwise, contact your administrator to continue the desired action.
3.Click Next and follow the instructions on the screen.
In the event that System Restore did not resolve the issue, you may undo the last system restore.
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