I get this same problem, too. Although, restarting my computer does not help. My OS is Windows Millenium Edition, I have 1.2 Ghz processor, 25 Gb free disk space, 512 Mb of DDRAM, and My copy of OFP is genuine with all current patches and Red Hammer installed. I am totally perplexed. There is nothing running in the background.
How do you set your Windows virtual swap file size?
Thanks in advance,
Scott W. Munro <Edgecrusher>