Ok, your hardware seems like more than enough :) Another thing to do is to visit CL's webside and grab the memory updater. The out of memory bug is very common in case of people using more than 1 Gig of virtual memory. This concerns both P4 and P6. If you are using WinXP/2000 try to max your v.m. to 4095 megs. If this does not work, the only (lame) way I can think of is to reboot a computer and reload the scene.