Hey, Sounds very much like a codec problem to me. If you havent ever done a codec update or havent done one for a long time then im fairly sure this is the problem. Codecs are the method of compression the videos use, if you pcs doesnt know the codecs used in the films then your likely to get this issue,try heading over to www.afterdawn.com and running a search on "codec packs",that site is in my opinion the bible on all things movie downloads related, personaly i ran the excellent nimo codec pack and ffdshow quite some time ago, and has thus far played everything i have thrown at it. hope this helps.