CS3 HDR doesn't complete

[Madwand]

I just took 6 bracketed 6MP shots in raw and selected them in CS3 for auto aligned HDR processing. Everything goes fine through the point where it says it's cropping, then the layer named HDR_untitled just disappears and it stops. I tried using different combinations of the 6 files such as just the first and last. No help. I also tried another set of bracketed shots. No help.

I then tried using just one raw file and created two extreme exposures from it, saved them and tried them in the HDR. They worked. After the cropping stage, the new HDR window opened and it showed me my really horrible result, asking me whatever it is it asks at that point.

This is on a 2.5G Dell with 512M ram. I think. Everything else on CS3 works fine.Can anyone tell me why CS3 will not complete the HDR process on my bracketed raw files?