This is what my system info with 64 bit cs 4 says. I can't enable the button under performance activating the hardware acceleration.
Adobe Photoshop Version: 11.0.1 (11.0.1x20090218 [20090218.r.523 2009/02/18:02:00:00 cutoff; r branch]) X64
Operating System: Windows Vista 64-bit
Version: 6.0 Service Pack 1
System architecture: Intel CPU Family:6, Model:7, Stepping:10 with MMX, SSE Integer, SSE FP, SSE2
Physical processor count: 4
Processor speed: 3005 MHz
Video Card: NVIDIA GeForce 8800 GT
Video Mode: 1280 x 1024 x 4294967296 Farben
Video Card Driver: nvd3dumx.dll,nvd3dum,nvwgf2umx.dll,nvwgf2um
Driver Version: 7.15.11.8206
Built-in memory: 8190 MB
Free memory: 5797 MB
Memory available to Photoshop: 7226 MB
Memory used by Photoshop: 84 %
Image cache levels: 4
Serial number: 92628752824465001218
Application folder: C:\Program Files\Adobe\Adobe Photoshop CS4 (64 Bit)\
I was using nvidias WQHL 182.06 as you were, all was working fine, then i updated to 11.01 and openGL is greyed out in prefs...
so i take it from this post that the only way to get openGL working again within ps 11.01 is to downgrade nvidias drivers, which is a shame because nvidias 182.06 driver has fixed alot of issuesw ive had with the 295gtx, so i hope this issue gets resolved as more people bring it to light, whether its nvidias or adobe that needs to do the 'fix'.
This is not a driver bug in my view but CS4 lacking in recognising appropriate drivers. Not that I care though, I find the whole OpenGL a big disaster and I don't see any major benefits that improve the quality of my work.
Current nvidia beta drivers 182.46 fixes the issue in my case.