Friends Laptop and graphics issue

[Heartless]

Basically, I let a friend borrow Freelancer, and ofcourse, like the rest of us, he loved it:)
Anyways, the single player with the CD works just fine for him, but...
when he plays on the Disco Mod, sometimes (mostly after jump gate jumps) his screen goes black and theres a pop-up saying something about graphics not working or something. The game is still running, I could see his ship still running, and he still had control of the game even though the screen showed nothing. He would always have to re-boot is pc.
Any ideas?
Many thanks.

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SwissScorch --> Heartless