Ok, I am using XP pro on a stand alone machine, not a server, at first I thought that the warning was happening when a I was using a graphic intense & Ram hungry program, but this is not the case. The program I was using at the time was Surpac, a 3D mining package, the last time I had just opened FlashMX when it happened.
I have increased the virtual memory again, but have not had a chance to test it yet – the machine is at my house, where I have no telephone / mobile or network connection (how sad) so sorry if I don’t reply sooner. I am starting to think that it could be a memory fragmentation problem, thanks IDLE, interesting article. Hopefully I will have good news on Monday.