Thanks for the reply. I did purchase the software through another email address (foster_jb@ yahoo....), but I was at work yesterday while posting on the forum, so I signed up with my work account. If you need any further verification from me, let me know.
It's unfortunate about the SLI, yet understandable. It seems I need to get a 3 gig video card.
Before I left work last night, I tried many variations in Thea: quick render in TR1 and then open in Colimo to see what happened. I found that the maximum I could do was 8 repaintable materials , relight turned OFF, and a maximum resolution of 1200x675 px. Then I was able to open in Colimo without it crashing, and also with the supersampling turned on.
However, I am still confused. Unless I am completely wrong, shouldn't Colimo have been able to open my original file, but with supersampling and precise mapping disabled? If I understand the screen shot correctly, that would give a memory estimation of 499 mb (the green number), which should be easily handled by my video card. Am I wrong? Are there settings which maybe I need to change in the NVIDIA control panel?