Didn't we have a similar problem to this a couple of months ago and it turned out to be a conflict with a background process? A screensaver manager or something like that?
Try the posts by Terry Kennedy regarding music and W7-64.
Starting here.
https://www.feldoncentral.com/forums...074#post119074
Terry described a slightly different set of symptoms, but it was W7-64.
One of the partial solutions was to install Windows Media Center.