Unlock files to delete and VISTA System RESTORE steps.

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Create and Use SYSTEM RESTORE in VISTA:
1. Type "system" into the desktop search box and select it from the list that is returned. Or you can open the Control Panel and then click the System icon. Either way you should end up the Windows Vista System applet.
2. Click the System protection link to get to the System Protection Tab of the System Properties applet.
On this tab you basically have two options: Create a restore point or restore from a previously saved one. Click the Create button to start the wizard.
3. Type in a description so you can recognize this restore point later on and click OK. Depending on your system, this could take a few minutes to complete. To restore system files and settings from a previously saved point you would click the System Restore button on the System Protection Tab on the System Properties applet.
4. This starts the System Restore wizard, where a list of possible restores is presented. Choose on of these points and click Next.
5. This is your last chance to cancel the process. Once the restore process begins you will have to let it run its course, which can take several minutes. Your Vista PC will have to reboot to complete the process. When it is completed your PC will restart with system files restored to the condition they were in at your chosen restore point.