x64 standby issues

[FireballX301]

I recently got a computer up and running, with an Ath64 and running Windows XP Pro x64 edition. Now, the computer goes into standby mode every so often while I'm in the middle of working.

I have a 450W power supply, but I'm hoping that's not the issue..anyone have any ideas?

 

[RealBlackStuff]

Check the power(saving)-settings in both BIOS and under Display Properties/Screensaver/Power