I use Performance mode, and set it to NEVER turn off ANYTHING, including the monitor.
I hit apply, etc etc.
It will hold this setting for a while, then after a reboot, or turning off at night, it loses this setting, and reverts to turn off monitor after 20 minutes.
Why is Windows 7 doing this?
BTW, Windows 7 Ultimate 64bit Signature Edition is what I am using.