50 t0 200 mb movie plays for 1 min
 

so ill download a movie clip. when i preview it at about 90% complete it semes fine and plays for about 20 min. but when it is complete it playes for around a min. this hapens with about 20% of what i download.
it started when my subscription ran out for limewire pro and i downloaded the ew verson about a month and a half ago.
so wtf is going on?