Invalid Format. T_T

When I start up MS it keeps giving me an Invalid Format thing on the side of my TV/PC. :/
I don't know why, it was working perfectly on sunday, but when I tried it yesterday it was all SKFDHJSD. If it helps I have this
http://www.bestbuy.com/site/olspage.jsp?...6141945915

I don't know what to do. T_T help please? :[

So you have your computer set up as: PC connected to TV and Monitor? Dual displays?

Try running setup.exe in your MS folder to set a new refresh rate.

If that doesn't work, alt+enter for windowed mode.

So you have your computer set up as: PC connected to TV and Monitor? Dual displays?

Ugh noo, I think? Um my TV has a PC IN, in the back and I have it plugged into my PC. And when I watch TV, I just press input on the remote. (input > TV) And to go back I do (input > PC)

@sicnarf I'll try that now :] *crosses fingers*
EDIT : THANKS SICNARF it worked