Generally after flying around for a bit and then going to a planet/station. In the bar or in a single player story line scene, I get screen corruption that takes over the screen. The sound continues and finishes. I can't click anything though. I can't shut down freelancer. I have to power down and restart and reload.

Does anyone have any ideas on how to fix this.
Do I use MS video drivers?

I have
Pentium 1.7Ghz
256 MB RAM
Leadtek GeForce ti 4200 64MB RAM
Latest Detonator drivers from nvidia - 41.09
plenty of hard drive space.