I found this in another forum:
"I have the same problem on more than one pc. But I think a norrowed it down:
my guess is, that it has something to do with Media Center, but I found no
Task (and no BIOS setting, device, ...) that could explain the RTC wake up.
Actually there is a "brutal" way to disable all wake events, I found that in
two Microsoft sources:
http://download.microsoft.com/downlo...mize_Power.doc http://download.microsoft.com/downlo...T302_WH07.pptx
Search the registry for bd3b718a-0680-4d9d-8ab2-e1d2b4ac806d
You find the "Allow wake on timer" settings for all powerplans. Replace
(also in subfolders) the value 0x000000001 with 0x000000000. You could set
it seperatly, you can see there are settings for AC / DC (battery)."
Maybe this can help you.
Bonni24