Thx for the tip. I read a little about people having trouble which is why I went for a Microsoft codec pack instead of a third party installer. So far I can edit and render just as before. Fingers are still crossed
I did not try to reinstall. I do not have the original installation software anymore. I need to try to fix it without reinstalling. I am using Vegas Pro 11.0 and the files I am trying are all avi. Some will work and others will not.