Windows 7 - Internet (on Demand) TV too big to fit on screen

I have just set up Media Center after having used Beyond TV for many years. I changed mainly to get closed captions but discovered internet (On Demand) TV included in my guide. I am happy that it is there but have a problem with it. I have configured the resolution properly in the set up so live TV displays correctly. Recorded TV also displays correctly. When I select a program from internet TV it initially displays correctly while I am viewing the thumbnails (for Craig Ferguson monologues for example) but when I click on one to play it, the screen flickers and the image gets too big to fit the screen. The controls go off the bottom of the screen and the minimize and maximize controls go off of the top right of the screen. I cant seem to find a way to resize this particular screen. In fact, I can not seem to find much of a tutorial anywhere on Media Center in Win 7. Any help will be appreciated. Steve