I have a solution for this problem.
I put up recently by nvidia with driver version 275.33 and OS with Windows 7 Ultimate SP1.
And before I get the same problem with you guys..
I found the solution by accident because so frustration, and work to date..
- Open your Nvidia Control Panel
- Go to Manage 3D Settings. You will see 2 tabs,
Global Settings and Program Settings.
- In Program Settings, add dwm.exe (Desktop Windows Manager) from
C:\Windows\System32
directory and set Power Management Mode becomes
Prefer maximum performance for this
program.
I hope this works for you too..