Have you checked for viruses and malware? It sounds like you may have been victimized by something.
Windows 7 Ultimate: When in a files window, how do I keep
a highlighted file in the same place on a screen when I leave
that window and return? I.E. If the highlighted file is at the
top of the screen and I leave that window and return, that
highlighted file is then at the bottom of the screen. I want
that highlighted file to remain at the top when I return.

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