This driver is an absolute disaster on my PC.
It like the driver messes up the harddrives access times or something. The first time i installed the driver i could see someting was wrong because normally my windows 7 boot is smooth and nice - now it was all choppy and windows wouldn't react to any commands eventhoug the mouse could be used. It was like only 30sec later windows would start respond. However trying to get into the nvidia control panel takes nearly a minute... Changing resolutions takes over 2min !
When running Vantage the load time is more than tripled compared to the 263.09 drivers where everthing would load smooth an instantly. Also I can't finish Vantage since it's like it just stops at the last CPU 2 test.
I can play games but it takes ages for them to load, however when loaded and getting into the game it runs fine. Exitting to desktop the the stuttering hell begins all over again.
It's like the clock settings are all over the place cause the GFX failing to respond or something.
I downloaded all latest drivers for sound and motherboard but 0 improvement.
As a last result I tried doing a totally new and clean windows 7 install and just using the windows default drivers for sound and motherboard.
As soon I installed the 266.58 driver things went screwy once again and the desktop would lag like hell with hughe latency. As soon as the driver is removed everything is smooth. Testing out 263.09, 263.14, 266.44 everything ran smooth and soft.
This driver is definitely not for owners of Asus P7P55WS motherboards... and frankly I'm suspecting it to be an issue with the NF200 chips used on some X58/P55 platforms.