I wouldn’t re-install
I wouldn’t re-install anything. If you feel that you need to reset Media Center, you can do it very easily. Just right click on Computer (if it’s on your desktop) and choose Manage, then open the little triangle next to Task Scheduler and open Taks Scheduler Library/Microsoft/Windows/Media Center and find the Media Center Recovery Task (its under the mcupdate entries). Highlight it and then choose RUN from the Action Menu. When you open Media Center it will be back to out of the box version and you’ll have to set it up. I’m not sure if you’ll have to run the Digital Cable Advisor again or not, but you’ll have to go through set-up for the tuner and all scheduled programs will be lost. Any protected recordings will still play.
But before you do that, what is your graphic card? Do you have the second display set up as an extended Desktop? One of those two should solve your problem and a new graphic card such as a GT430 nVidia isn’t very costly to solve your problems if it’s HDCP related.
Resetting Media Center will not solve a HDCP issue so make sure that’s cleared up first. Then if you have other problems, those can probably be worked out without resetting MC as well. Things are a little touchy when you’re dealing with CCI protection on cableCARD recordings since a protected path is required from the signal to the display.
John