I have had beaucoups problems since posting this query, a percentage of which have been computer related, so I haven't been able to get back to it or do anything else much on Internet lately. Thanks for the response, Louis. Since I haven't been back in so long, I don't expect you to see this, but am posting anyway.
I did pursue the Computer/Properties/Tools/Error-checking option yesterday. However, since I had other things to attend to and wasn't at the pc when the last of the five checks completed, the computer apparently restarted itself. So I wasn't able to see the result of the lengthy process, as I suspected would happen. If there was a report, it could be located in a log somewhere on the hard drive, but I am at a loss as to how to access it. Since I got no error messages or alerts after the reboot, I assume that there are no problems with my computer's hard drive. Nothing seems to have changed as far as the OS quirks are concerned, however.
I will say that the OS has been on a generally upward curve as far as reliability is concerned, though the progress has been excruciatingly slow since that reformat in January. Its condition immediately after that was appalling; at least I now get some use out of the pc.
Edited by ToborTheGreat, 29 April 2011 - 12:58 PM.