I have not installed a new card. This is the one I used on this machine with XP and then WIN7, andI think it was working OK a while ago.
It sort of come to mind that I started having problems after I installed SP1.
I uninstalled SP1 a couple of days ago just in case and it made no difference.
I am also having a problem with several of my Adobe programs not loading because they hang up when loading 'ExporterAVI.prm'. I can not find any info about this problem anywhere on the Net including Adobe.
Thinking the problem was a bad WIN7, yesterday I did a nondestructive, in-place, total reinstall of WIN7, hoping that would help. It did not.
I have decided that I will have to live with this problem for another month until I have more time to reformat and start from scratch.
If you have more ideas, I am willing to try.
Thanks for all the suggestions.