Error: Can't Access System Restore - Disabled by Group Policy - or System Restore tab missing
Go to Start - Run and type regedit then press enter.
Navigate to the following registry Key.
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Win dows NT\SystemRestore
In the right pane, right click on each of these Value Keys and select delete.
"DisableSR"
"DisableConfig"
Close Regedit. Right click on My Computer and select the System Restore tab. A reboot may be necessary.
If the above doesn’t fix the issue, there’s a registry edit at Kelly’s Korner.
Look on line 278 left side.
http://www.kellys-korner-xp.com/xp_tweaks.htm
These steps, and registry fix are also known to repair the inability to enable System Restore after it has been turned off.
More information on “System Restore Group Policy restrictions”
Note: There is a good possibility this was caused by malware/virus infection. Click here for cleanup instructions.