This is AFTER your produce the video to a file or DVD? You may have some issues related to proper encoding of the project.
Please run a dxdiag.exe evaluation of your computer. Set it to produce a text file and then attach the text file to your reply. Do not copy the text file and post the long list of information.
What esle do you have running during the production of the file - antivirus, e-mail, etc?
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BoilerPlate: To posters who ask for help -- it is nice to thank the volunteers who try to answer your questions !
Anything I post unless stated with a reference is my personal opinion.