I'll try VLC, but thing is the files that tend to have problems tend to be like.... it seems like if the file is either 1080p or else 400+mb then it'll have problems playing on this machine. Now, the machine has 512mb of system ram and a 128mb video card so I'm not sure if that's the problem or what.

Then again, if I load a DVD movie with Daemontools and play that, MPC has no issue, and DVDs are far bigger than 500+mb so.... not sure how that works.