cumputer reboots

[robert rorick]

If I let my computer set, It will reboot a blue screen
shows up stating a device problem and it preforms a memory
dump and counts down and than reboots back to windows
desktop. This will happen about every half hour if you do
not use the computer if you are using it, It will not do
this. And while playing a CD Rom game it will just shutoff
the game and go back to desktop and your have to restart
the game, this just started this week. Thank You for any
help.