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#11
You could try and setup a new administrator account to use instead to see if you get the error for it as well. However, if you wish to try and fix your old user account, then you may wish to try the tutorial while logged in the built-in Administrator account to see if you may be able to.
While doing a System Restore, you'll easily see the dates of each restore point. Step 7 in Method One in the tutorial below can show you more on this though.
System Restore