I have just installed windows 7 64-bit, and my graphics card is nvidia geforce 9800 gt.
The problem is that my screen resolution is stuck at 800*600 with color depth 16-bit, and i can change it.
I have tried EVERYTHING with no results.
Can you give me a solution???
Make sure to check that your monitor is being listed and not plug and play - even though P&P should give you a higher res. Also do you have on board video? Possible conflict? You may want to install older drivers and make sure you are getting the Win 7 x64 versions from the nvidia site. Maybe "uninstall" the vid card in the hardware manager and then select detect hardware - see if windows will redetect the hardware and install it correctly. Or uninstall the Nvidia drivers, reboot and see what res you get with the MS drivers. Or download Riva Tuner and see if you can set the resolution there (if you haven't tried the Nvidia control panel yet).
Googling this problem shows that the solution usually comes from windows update. If nothing has yet appeared to fix it then it might be case of waiting until they do. I would however try the Nvidia forums just in case someone has found a fix to this issue..
Another option would be to try different driver sets, you can find a good range here: