I don't know if its a windows 7 fault and if it can be solved but I was watching BBC iplayer on full screen last night away from the computer sat down and this used to be fine on my old windows xp setup I should mention but every 10 mins the screen would go into standby mode cause there's been no movement of the mouse or keyboard activity. So I kept having to get up and move the mouse, I've checked my windows 7 screen saver and its set to none so I wondered if anyone here can help me to alter the settings or where to look.
Try this, go to start and type power in the search box. Select power options in the above list. In the window that opens select High Performance, then change plan settings, 'turn off the display'- never and 'put the computer to sleep' to never.