Photoshop :: CS4 Crashes Regularly

As others have already reported, I'm also experiencing repeated crashes
when using CS4. This can happen at any time:

- when loading an image
- when creating or modifying a selection
- when editing the image
- ...

No obvious pattern detected. After the crash, when I relaunch PS, I
often (not always) get a message telling me that GPU acceleration/
OpenGL drawing has been disabled. However, I also had crashes with
OpenGL drawing disabled.

I'm using a Windows XP Pro SP3, a GeForce 6600 GT with the latest driver
(version 178.24, October 15, 2008) and the motherboard is an ASUS
A8N-SLI Premium running an AMD Athlon 64 X2 Dual Core 4400+ with 3GB of
RAM.

I recently made some changes to the NVidia settings and had no crash
since then:

- Use my advanced 3D image settings
- Anisotropic filtering 16x
- Anti aliasing : 8xS
- Conformant texture clamp: Off
- Error reporting: Off
- Extension limit: Off (if you set this to On, PS crashes and disables
OpenGL drawing)
- Force MipMaps: None
- Maximum pre-rendered frames: 0
- Single display performance mode
- Texture filtering settings: Off with exception of 2
- Negative LOD Bias : Clamp
- Quality: High quality
- Threaded optimization: On
- Triple buffering: On
- Vertical Sync: Force On (also On in PS as well as "Force Bilinear
Interpolation" and "Advanced Drawing")