I had to go out for a few minutes this morning to deliver a letter. When I got back, my computer seemed to be as it was when I left. I opened my Outlook Express to look at my emails. I needed to refer to an email I had sent a couple of months ago so clicked on Sent Items, and that's when I realised that there was something wrong. There were no emails there later than a couple of years ago. That's off I thought. I tried opening Excel but I got an error message saying that the file couldn't be found. I then tried the Ctrl-Alt-Delete to see if I could see anything odd, but I got a similar message. It was obvious that something seriously wrong had happened. Initially I though I would try System Restore but got the same error message.
In the end I thought rather than close down my computer as normal I would just switch it off. I did that as normally on close down (even if it were to work), it would save the system settings and if those had become corrupted I wouldn't want to save those. I switched back on and it rebooted as normal. Everything seems to be OK now but I did notice when I opened Excel and went to open a file it took longer than normal for the list of files to appear, almost as if it was having to recreate them.
I've had a look at the Windows Events Manager to see if there was anything odd there but couldn't see anything.
It's a bit disconcerting when something like this happens for no apparent reason. It's possible that something happened while I was out and that some warning message appeared on the screen which had gone by the time I got back.