da5176

I just installed new RAM on my computer. I went from 512mb to 1024mb. My system is a HP Pavillian a320n AMD Athlon 2800 2.08GHz XP home edition SP1. Everything has been running just fine with a noticable improvement in speed for some programs. The computer recognizes the RAM just fine. The problem is this... I go to start a jet fighter game I have and it starts with some flickering on the screen and just stops by itself and I'm back to my desktop. I keep trying and it forces my computer to re-start. Sometimes the game shuts off in just a couple of seconds, sometime in a few but no more than 5 seconds. I ran my fix a problem program under help and support and it tested my RAM and found no issues. The game didn't run well with my 512 RAM, it stalled sometimes so I haven't played it in a while. I wanted to see if the new RAM let it run any better now. But it won't run at all now. Anybody got any ideas as to what the problem is? The game or the new RAM? Or what? I don't have the game CD so reloading can't be done. The game is Jetfighter 2015 by Global Star.
Thanks for any help / advice anybody can provide.