Ok,, well that is a problem....
When you install the driver,, are you right clicking and choosing Run as Admin?
When you do a fresh install of 7...
When you first install 7 and it asks you about settings, tell it you will configure it later. This is telling Windows Update not to run yet.
Do not let windows update install any drivers if you can help it
Do not install any software at all.
Then install Chipset and motherboard drivers first,,
Your system should be using generic VGA type drivers to start off with. If not,,,,
Go into Device Manager and uninstall the driver from there,, if/when it asks to remove drivers, say yes.
This should revert you back to the generic VGA Drivers.
Then try the nvidia drivers.... You are getting ( i think) a driver conflict.
between the Windows Update install of the driver (which you don't need, and should never install) and the official one.
However, I am not running 7600, and I have an 8600GTS with all the latest drivers.
However,,,,, searching google,, this error seems to go back a long ways. I have never experienced it myself.
The other I might suggest is a BIOS update, if available.
Configure Automatic Updates to only do critical updates and check for Recommended every once in a while and hide all drivers as they appear. I never run driver updates from Windows Updates. They have always caused some sort of problem with numerous systems I have used, built, worked on, or sold.