I am running on a laptop, IBM think pad T20, 750. 128 mb ram, s3 savage IX vid. with 8 mgs. sound fusion audio. DVD Rom is matshita??

I couldn't get all the normal software programs (Power dvd, win dvd) to work. But a move that i had came with a program called PC friendly dvd. That worked. The only problem is when i'm watching a movie, at some point, the stupid windows "illigal Operation" pops up forcing me to shut it off and start over. It can happen at any point. I have only made it through 1 movie without that happening. Any idea what would cause this?? Video, memory?? confused.

Sorry, OS is win98 se.

Thanks,
April