nVidia A/V Capture driver install problem

I've had to do a reinstall of Win XP Pro since my wife picked up a nasty virus of some kind that I couldn't get rid of. It was the 'Vista Anti-Virus Scan' scam that tells you your computer is infected and keeps popping up saying if you just buy their program it will remove the virus. It then proceeds to populate the desktop with icons for porn sites. (What kind of insane idiot spends his time thinking these things up?)

I decided the best thing to do was just reformat and reinstall.

I did the reformat and reinstalled XP and since I have an older OEM copy of Win XP, I installed SP2 and SP3 from files I keep on a CD before I even let the system connect to the internet.

After installing SP3, I installed the drivers for my twin 8800GTX's and tried to install the WDM drivers. I kept getting errors installing the WDM drivers and then the same thing when I tried to install the HD audio drivers from the disk that came with my 790i Ultra MB.

They would install, but then give the message that "This device cannot start, Code 10".

In Device manager the drivers for the on-board HD audio and the A/V Crossbar and A/V Capture had the yellow exclamation marks on them. I couldn't get any audio at all.

I did some reading on the internet and read that SP3 can cause installation problems with some drivers, so I uninstalled SP3 and tried to reinstall the drivers.

The audio drivers installed just fine, and so did the A/V Crossbar drivers, but I'm still getting the same message and yellow exclamation points for the A/V Capture drivers.

I've tried uninstalling and reinstall quite a few times, and nothing has worked yet.

The first time I installed XP when I first built the computer, I don't remember having this problem at all. Everything seemed to install just fine then, a couple of months ago.

Any suggestions?

Thanks!

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EVGA 790i Ultra MB
Intel X3360 CPU with ASUS Silent Knight II Cooler
Two BFG 8800GTX OC's in SLI with twin, 24" widescreen monitors
4 gig Corsair DDR3-1333
WD Raptor 10K RPM 150 gig SATA HD for OS
Two Seagate 500 gig SATA2 HD's for storage
Two Samsung SH-203 SATA DVD drives
Silverstone Strider ST1000NV 1000 Watt PSU
Win XP Pro and Vista Ultimate in dual-boot setup
Thermaltake Armor V8003BWS case
Klipsch Promedia 4.1 400watt sound system