South Africa
Hi omel,
use HTPCInfo TVServer Monitor from here and check the option "Shutdown Prevention".
Cheers, Micropolis
Just use the powerscheduler ++ plugin (it will replace the builtin power scheduler). Set windows power options to sleep in x minutes, then set ps++ to htpc profile. The option to prevent shutdown is called Away mode, as w7 does not allow programs to abort a shutdown, they may only enter away mode, which is basically pc is running with no video & sound output.
You can reapply the profile and disable the Advanced Options. One last remark (I was not sure about that): PS++ can not prevent a shutdown, but "just" a Sleep command. Since Windows 7 does not allow programs to abort a user initiated shutdown, hibernate and/or reboot MCE "should" have trouble doing that (unless MS allow their own SW do do things on the OS others are not allowed to do, shame on them).