Visiontek Problem...............

I got my friend a Visiontek GF3, and in ever game, every 3d app. Every 5 or sdo seconds their will be a slowdown. In Elite Force the FPS counter goes from liek 100 to 13 or 14 then back to 100 .. int he chameleon demo every 5 or 7 seconds it will slow down (and it is not durring the chameleon texture transitions either...)

Any Ideas?
here are system specs.

Asus P3f-b Mobo
P3 850
256 megs of ram (agp apature at 128)
win98 SE
VT GF3
Diamond Mnster sound MX400
Ethernet Card

No idea whats going on with it...
I really neeed to get this thign back to him.. so if anyone has any clue .

BTW everything in the background is closed ive checked everything, startup, MSconfig, registry)

no program running is causing this..

Thank You

Nick D

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P3 600 OC to 800
256 megs Mushkin PC150 RAM
Abit BX6 Rev. 2
Santa Cruz Sound Card
Hercules Prophet 3 12.60
TDK VeloCD 12x10x32
102 gigs of space

reformat and do a clean install of windows (its always good to do this when you replace either CPU, or Videocard or mobo). backup what ever info you need to. reinstall, and download the latest OFFICIAL drivers, some demos, 3D Mark 2001, and play around with them once you get all the drivers installed

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The "other one"
1000EB
Taisol CGK742092 w/ 19CFM
Abit SA6
256MB Crucial PC133 222
Maxtor 13.6GB 7200RPM
Western Digital 20GB 7200RPM ATA100
Samsung 8x DVD
HP 10x4x32x CDRW
ATi Radeon 64DDR VIVO @ 243MHz Core/Mem
Turtle Beach Santa Cruz
Intel EtherExpress Pro/100 S NIC
Win98SE