physical memory dump error

I just bought a new computer (a Gateway GT5428) about a month ago that came
with Vista Home Premium on it and not too long ago it started having the blue
screen pop up and say "physical memory dump" and than my computer restarts. I
try to catch the error code, but it disappears so fast that I have not been
able to. I've noticed this really only happens when I'm surfing the net and
it doesn't happen too often.

I know I should give the error code, but maybe some of you could give me
some suggestions about what could be wrong anyway. Any suggestions would be
much appreciated, thank you.

Open the Control Panel, go to System and Maintenance. Open the Advanced
settings, then go to the Startup and Recovery section and click the Settings
button there. Turn off the automatic reboot feature when an error happens.