Resolution problem with Toshiba tv software for Windows XP

I have a Windows XP PC and a Toshiba 32DL66PS LCD TV which is 32 inches. I have downloaded this toshiba tv software for windows xp. I can get the TV to work fine but the resolution is not that good. The desktop displayed a resized image of the TV that is why it is not focused and part of the desktop monitor is missing. I tried adjusting monitor resolution and I can only get good result for resolution 1024×768. I want to use the resolution 1366×768 but the output is not good. Can anybody help me in configuring the setup to display quality output with resolution 1366×768
