Microsoft Photo Editor

I hate to be the bearer of bad news, but it is possible you have a virus. The Loveletter worm and others overwrite jpg files ruining them forever. One test for this is to look and see if the jpegs are all the same size (though this isn't always the case).

I'd get an updated virus scanner to look at your system...especially if this happens even when you copy new (good) jpgs to your system.

If you are virus free, then installing/re-installing Photo Editor again may well resolve the problem. It may be that the software has been corrupted...but the vast majority of times I've seen a problem opening jpg's lately, it was a virus issue.

Good luck.....hope this helps!