Photoshop CS4 Crashing Problem

Question

I recently  lost my main desktop and my backup. Neither are repairable, so I've had to switch to backup number 2. This is an '05 Dell Optiplex GX280 small desktop, with 1GB memory (soon to be 4), a 160GB hard drive, a Pentium 4 3.0 GHz CPU with Intel 82915G/GV/910GL integrated graphics ( I think it's 128 M) and a 210 W  PSU. The GX280 is basically an office computer.
I didn't bother to load CS5 which was itchy on my previous desktop, but I did load CS4. Although it loaded smoothly, and usually opened w/o problem, it always crashes at or before the first operation I perform, regardless of what it is. I did install the updates. I have CS4 Extended, so I tried the complete install and the bare bones install, without difference. I've uninstalled and re-installed several times, always deactivating first.  I suspect the graphics since I got a "Display driver problem, GPU enhancement disabled" message once opening, but the program didn't crash until I tried to perform an operation, or save something I worked on.
From what I can tell, graphic card upgrade possibilities are very limited, although the specs do mention a PCI Expressx16 DVI card option. It doesn't look like upgrading the PSU is possible. The community thinks this is a Dell unique PSU .
I installed CS2 and it works flawlessly. Upgrading  to a new comp in the near future isn't an option..saving my pennies (or card limit!!) though. I can muddle thru on CS2, but I'll really miss CS4. Any CS4 workarounds suggest themselves?  I'm not adverse to spending a few bucks on a new graphics card if that will do the trick either.
Thanks,Ed

Answer 1

No worries, Ed, Bill and I get along very well. 
Computers usually have VERY specific memory requirements, so you'll want to make sure you're looking at memory that exactly matches the needs of the system.  Some memory suppliers like Kensington (or was that Kingston?) have configurators on their web pages to help with that task.
Did you make a typo?  If you're talking about a nVidia geForce 6200, that card is ancient and not advised for Photoshop use.  It gets only a 57 on the benchmark at this web site:  http://www.videocardbenchmark.net
Look for a card that benchmarks at least 500 or higher.
-Noel