It's definitely coming from within WMC. WMC was still running. The PC did not reboot. No linux on this machine. Only Win7 64bit...
Pressed INFO on remote, said "no info available" with no channel number.
Pressed CH up/down, did not move or change.
Pressed guide, went to guide, selected first highlighted channel, got audio/video.
But I can say it again-
Don't have any other OS on this machine.
The machine didn't reboot.
I can press INFO on my remote and see the WMC banner come up but doesn't say any channel number or program info.
I can press GUIDE on my remote and then ENTER/OK and it will retune Live Tv.
I can minimize the WMC window, see my desktop, see that the Red Hat prompt is inside WMC.
It's a 4x3 black background with:
Red Hat Linux Version 9 (shrike)
Kernal 2.4.24 on an 1606