mpeg/mpg problems

I have a few video files that seem to have a 2 serious problems.

Everytime I try to play a 15 minute file or so, it will show the first 20 seconds of it and then freeze video and the audio will continue. If I skip ahead past the frozen point it will freeze all together.

The second one is that a file that is 5 minutes long will only register as 19 seconds. When I play it, it will play 19 seconds of it and if I skip ahead 9 seconds, it will appear 2.5 minutes into the movie, but it will play it till the 10 seconds are up and then it ends.

HELP!!!!!!

 

Corrupt or incomplete would be my guess.

 

I thought that too, but when I redownload them, it does the same thing.

 

you may need to update your codecs.

 

I deleted and reinstalled all the codecs I can think of. I cant think of anything else. I tried new codecs, old ones, I tried redownloading the files. I tried playing them in different players. Only thing I can think of now is defragmenting my hard drive. If that doenst work, Im all out of ideas.

Really sucks not being ablbe to watch my simpsons episodes