go to your desktop, right click and click properties, click the "screen saver" tab, click "power," and look down where it says "system standy" and change the amount of time.
right click on your desktop...go to properties...choose the screen saver tab...then click on POWER ...then see where it says Settings Home Office/Desktop if they have 5 mins etc on all the arrow pointing down...change them to NEVER...hit Apply and then OK ....then again OK and that's it..