8800 gt showing 0mhz core clock!

I need some help here. My card has been running fine (EVGA 8800 GT) for the last month since I got it. I've recently been looking at possibly overclocking it, but haven't even started the process. I downloaded some programs such as rivatuner, atitool, and gpu-z to just get ready. I loaded gpu-z, and it showed everything fine. I then upgraded to the most recent drivers for the card off of the EVGA site (177.79) and restarted, and ran 3dmark vantage to get an idea if it did anything. I left the computer while it ran, and came back to a very low score, lower than I've ever gotten by a lot (about 2000 less). The GPU score was really low, and the cpu score was some crazy number about 7x as high as it ever was. I ran gpu-z, and it now showed my core clock and memory clock speeds at 0mhz!! I then rolled back the drivers to the previous one (175..19) to just test if that was the problem, rebooted, and gpu-z, as well as the system scan in 3dmark vantage both show the core clock and memory clock still at 0mhz!! I don't know a lot about video card bios or how to reflash it or anthing, and was wondering if someone could give me some insight on how to fix this problem. Thanks!!!

OK for me i think i found a solution. I dont know if its the same case with u or not. Anyway i think the nvidia thing is not working properly. i got a program called GPU'z (like cpuz but for gcard). it says i have clocks of 450mhz or wateva, normal. anyway here is a screenshot:




Hope it helps.