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I hadn't looked at any links, pinkyboyid. I did check the recycle bin - not there.
I can't find any info on my PC about back up times etc. but I don't have a System Restore option under Start -> All Programs -> Accessories -> System Tools so not sure how I'd go about doing it anyway. Don't remember seeing a Windows Advanced Options menu when I booted in safe mode earlier, but that doesn't mean it's not ! LOL Only one way to find out (!) & I really can't be r$ed now. Will come back to it tomorrow & work out what I might need to back up if I can find a way to restore not-too-far-back. If at all ! But appreciate the help ... :)