Hiya
You say that you have tried opening the forms on two other PC's. Were these also running Norton or not? If so, have you tried uninstalled Norton to see if this soves the problem? Not a great idea, but its a thought.
Just been to the site, but their support for your product is down. Surprise, surprise
Okay, I'm in the forum there, but you're not gonna like this:
Norton software is known to wreak havoc in too many systems using anything other than MS Office and Internet Explorer ONLY. Uninstalling that stuff sometimes require reformatting the hard disk and going back to square one, including the loss of some valuable files.
Before you attempt uninstalling the Norton software, I'd suggest you copy/send your OmniForm files to a Norton-free computer and try opening them there. If they work, you'll have found the culprit.
Good luck! You'll need it!
If you want to join there and see if they can help as well, here it is:
http://webboard.scansoft.com/~omniformwin
Regards
eddie