Is it just that game? I've had Windows Update install/update Drivers on me but in the process it completely removed 3D Vision...
If that wasn't the case then 3D Vision has been known to just break itself...
Deleting "C:\ProgramData\NVIDIA Corporation\Drs\nvdrssel.bin" will reset the Profiles... other than that DDU/Reinstall
[MonitorSizeOverride][Global/Base Profile Tweaks][Depth=IPD]
If that wasn't the case then 3D Vision has been known to just break itself...
Deleting "C:\ProgramData\NVIDIA Corporation\Drs\nvdrssel.bin" will reset the Profiles... other than that DDU/Reinstall
[MonitorSizeOverride][Global/Base Profile Tweaks][Depth=IPD]
http://blog.counter-strike.net/index.php/category/updates/