A couple of possibilities,

1. Corrupt disk sector or bad file. Defrag your hard disk, delete all temporary file snad try re-creating your movie.

2. Corrupt memory address. Not my field of excpertise but I am sure some of our techy friends will point you in the right direction to check and fix bad memory sectors.


Good luck

__________________
IBM A51p with 160Gb Boot Disk, 160Gb external Firewire Disk, 2Gb Memory and a super duper sound card, 17\" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
ULead products mostly including Mediastudio Pro (V8.0), Video Studio 8, Movie Factory 2.0, Premiere Elements

Remember, there is always more to learn than there is to teach.