9800GX2 major problems

hi all well as the title says im having major issues with this card where to the point i feel like returning it i have been thinking that it has been a driver issue ive nearly replaced all my parts with newer updated parts,ive done all sorts of things to fix this but still no luck.
PROBLEM;call of duty 4 lags/slow response
PROBLEM2;other games do simalar performance
ive tried all sorts of drivers some of which work better and some that are utter crap i have been using 174.53 as its much better than 174.74 with .74 desktop performance was crap ive done about 50 reinstalls not KIDDING!!! and installed each driver i had first one by one reinstall by reinstall googling this i found many people having this issue too

if someone could please help me i would be much appreciated
am deciding to return if not fixed soon

SPECS
qaud q6600 @3.4ghz zalman 9700 av40 load60
9800GX2 174.53 55 idle 60-70 load
4gb ram 1000MHZ dual channel
raid-0 500GB
p5e board 2.0 pcie
640 watt corsair
verry good cooling
ps 8800 ultra was very smooth
thanks a bunch

Sounds like time for an RMA
I had a 7900GX 2.......Drivers were a major issue at the time.......and one card died after 3 days,giving crap performance.
Personally I would go for a 8800GT or 8800GTS Ultra........Personally I really can't justify a SLI set-up either..........by the time you can afford it,theres something "NEW and Better" anyways.JMO

thanks for the reply yeah ive been thinking its been a hardware problem and i would love to RMA it even if it was only drivers but the thing is ive only just got it back frm a stepup which took mor than two weeks for it to be stepedup you know so im hoping its drivers which is what i believe it is as ive tried different drivers and they have given off different effects like the 174.93 almost perfect in call of duty 4 crudy in crysis then 174.74 call of duty crudy and crysis pretty good well i dont know what to do might have to sell it
thanks
DAN

what do you thnk mate

why i think its drivers is because the fraps shows constant 91 fps never drops and there is a slight lag at times and slow response to my mouse movements thanks
DAN

Stupid Question ............but do you use a Driver Cleaner when you uninstall the older driver???

thanks for the reply um yea i started using them but i found no point in doing so because i was just doing clean reinstalls twice a day
UPDATE:installed xp64 everything working games exellent but crap because i cant use this xp its not my key and have to uninstall it soon so have to figure out how to get it to work on vista

Lol