Windows computer locks up when not used for a short time

[dacobb]

If computer Vista is left on and not used for a short time the computer will lock up and you have to reboot to get it going again. Does anyone know why? and how to fix?

[roraniel]

Is the problem when coming out of hibernate? See A Windows Vista-based computer stops responding when you resume the computer from hibernation

Also there were some know issues with some NVIDIA Drivers causing problems resuming after Windows shut the monitor off for power savings. You could set it to never turn the monitor off in power settings. Right click the desktop click personalize, click screen saver then click change power settings. Also I read the latest NVIDIA drivers supposedly fixed the issue. Drivers - Download NVIDIA Drivers