GPU Settings Became Unavailable PS CS5 32 Bit on Win7 x64

Question

I have an ATI Radeon HD 4670 card by VisionTek with 1 GB of RAM in my Windows 7 x64 Ultimate 8 GB workstation.  I run a dual monitor setup, and have all video driver software up to date (as well as Windows 7).  The system is running perfectly, not logging any errors nor exhibiting any signs of other problems.
My video card/system have supported GPU acceleration since PS CS4, and when I first installed PS CS5 I was able to immediately configure the settings to enable OpenGL Drawing in CS5 32 bit, then exercise the GPU (after a restart of CS5 32 bit) but now the settings are unavailable and the software reports "No GPU options available with Photoshop Standard":
The 64 bit build of PS CS5 DOES allow the GPU settings, and it works with them just fine:
When I initially ran CS5 32 bit I was NOT running Aero (i.e., the theme was Windows 7 Basic), as I was sharing my desktop with a co-worker using RAdmin (so we could both experience the installation and setup process).  However, manually selecting the Windows 7 Basic theme now does not re-enable the ability to configure OpenGL Drawing.
The only things I did between the time the setting was available and wasn't was to arrange my palettes and create a Workspace within which to keep them.
The memory setting (shown at 100% above for CS5 32 bit) does not affect this issue.
Any ideas how to get back OpenGL acceleration in 32 bit CS5?
-Noel

Answer 1

Note:  I edited this response after seeing your second response.
On initial startup Photoshop 32 bit is offering the OpenGL configuration, implying the driver has said that it CAN do the OpenGL operations.  Additionally, when enabled (on the first Photoshop startup or subsequently via the registry tweak) the functions DO work, flawlessly from what I can see.
It doesn't MATTER why it doesn't work.  I (the user) don't have the facilities to MAKE it work properly nor even to diagnose it further.  You do.  Thank you for agreeing to look into it further.
There are several purposes a forum can serve:
1.  Users can help other users get around problems they have, either because they've done something wrong, or via a workaround.
2.  A dialog can be created between users and developers.
Please, let's not allow item 2 to be an avenue where Adobe just tries mightily to dodge responsibility for the problem.
It's YOUR application that does not work properly.  Everything else works great.  You'll have to trust me on that - if I could provide some additional proof (system uptime info? reliability index? what?) I'd do it in a heartbeat.  I can assure you've I've installed the drivers correctly as well.
I'm a career software developer myself with 34 years experience.  When Windows 7 first came out users started to report crashes of Photoshop after using one of my plugins.  Did I tell them "It's the fault of Windows" or "It's the fault of Photoshop"?  No.  I apologized that MY application was not working perfectly under those conditions.  I then investigated the problem, found that a Windows call having to do with using a patterned pen was causing memory corruption in Photoshop, and developed a workaround so that with that particular combination of software the crash is averted.  I also then reported the root cause of the bug to Microsoft.
-Noel