GeForce 2 disapears?

[Majesty]

Hello, times to times, when I want to play a game, for instance EverQuest, it tells me I have no 3D Card. And if I run Unreal Tournament, it runs in Windowed Mode, I can't shift it to Full Window mode. But if I reboot my machine, everything comes back to normal, I can run EQ and UT without any problems. What might cause mu GeForce 2 to "disapear" ?

Thanx
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P3V4X (BIOS 1006 Beta)
128MB of RAM PC-100
PIII 550@733
Asus V7700
SBLive
SCSI Card
NIC
ATi TV-Wonder
Pioneer DVD-Rom (SCSI)
Yamaha CDR8424S (SCSI)
4xIDE HD
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[Looney]

No idea... but any time i have wierd problems like that, i would try reseating the card and reinstall the drivers (especially this).