Hooked up my 26" HDTV to PC but...?

Today i hooked up my 26" VIZIO HDTV to PC with HDMI but the desktop and text looks jagged and fuzzy.. but when i played a 1080p movie, it looked amazing, I have a powerful graphics card so i know thats not a problem. i have tried Cleartype and DPI text scaling but both didnt do much,