Without sitting down at your computer it's hard to guess exactly what is causing the problem. One question though, does this happen with other programs or just Fs9? Also what does the message say when you get the blue screen?
You might also want to watch when the computer is booting to see if it's counting up all the memory. It could be possible that you bought some bad memory or that the stick you had in your maching was bad. I'm not certain exactly where you can find it but there's a memory testing application called "Memtest" that can check memory for you for bad spots. You might want to give a look for that utility and run a test on your new and old memory.