Genport i/o initialization error

[TomeTome]

Hoi, the following error appears when I try to run
games at fullscreen: "Genport i/o initialization error"
or the game (Diablo II) starts and then chrashes after a while.

I have verified this, as both Unreal Tournament and Diablo run fine
in windows.

Anybody know whats going on?

My setup:
AMD Athlon(Thunderbird)@800
ASUS A7V board (BIOS 1004c)
128Meg RAM
AGP STB 4400 (Riva TNT 16Mb) with 631 drivers (Nvidia reference)
Windows 2000 Professional
PCI 128 Soundblastersomething
PCI Networkcardsomething

Also on a side note, in the bios setup AGP fast write is disabled.
Should I turn this on (compatibilty? speed?)

Thanks in advance, Tome