One of the card is not shown under display adapters!!

oxckbs

Distinguished
Apr 14, 2009
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Hi guys, I just got a problem last night after i installed the newest driver for my desktop, but i found out that there is no SLi option,and even worse is one card is not even shown under display adapters. so there is only one card is working, but where is the other?

Info of my DELL XPS720

OS:Windows Vista Home Premium (6.0,version 6001)
Bios: Phonenix ROM BIOS PLUS Verison 1.10 A06
CPU: Intel core2 Extreme Q6850 @ 3.00Ghz(4 CPUs)
Ram: 4g
DirectX: 10

Video Card: NVIDIA GeForce 8800 GT 512M DUAL !
Driver version: 182.50


HELPPPPP!!