*r. and Mr. S*th.avi

I downloaded this movie last night. It wouldn't run in my Windows Media Player, saying it didn't recognize the codec.

Now, when I try to delete the file, it says it can't because it is being used by another program.

I think this might be a malicious file.

Any suggestions how I can delete this file, and find out what the other program is that prevents me from deleting this file.

Thanks