Inventor 5/6 - I think I'm going to need a bigger boat!

[roknjohn]

I thought that I had a pretty decent machine:
Dell Precision 530
DUAL 1.4 Ghz Intel Xeon Processors
256MB RAM
Matrox Millenium G450 AGP - DualHead

Well, I tried installing Inventor 5 & Inventor 6. Both installed ok, but when I attempted to run either, I got a OpenGL error. I tried setting the Tools|Application Settings|Hardware.. options, as well as downloading the latest video drivers.

With a few of the hardware settings under "Application Options," I was able to suppress the OpenGL error. But, if I try to open even the simplest part file, or create a new "standard.ipt," the system crawls - and I mean crawl. e.g. It takes 2-3 minutes to paint just the menus and tool bars. If I click on a menu item, it takes about 10 seconds to drop-down. Completely unusable!! (The weird part is, the initial 3D rendering of the part is fairly quick, its the non-graphic windows that seem to be the problem.)

I've tried turning off the dual monitor mode, using 16-bit color depth, 1024x768, etc., to no avail. I didn't expect blazing performance but I at least thought that I was better than the average bear. :-)

Do I need to upgrade or do you think it's an installation problem?