If you want to reset WMC back to day one and start over here's how.

Goto Control panel, Folder Options, View and select 'Show hidden files and folders'

Save and restart pc in safe mode by hitting F8 at boot (this is so WMC services are not running)

Navigate to C:\Program Data\Microsoft\ehome

delete folder mcepg2-0 and file mcepg2-0.db (this is existing WMC data)

restart pc normally

goto Folder Options and re-hide hidden files and folders

start WMC and click live TV setup

WMC sees my othet TV tuner, but I still cannot record at the same time-folder_options_view.jpg

WMC sees my othet TV tuner, but I still cannot record at the same time-ehome_delete.jpg

WMC sees my othet TV tuner, but I still cannot record at the same time-wmc_setup.jpg