Now days, many computers come equipped with a HDMI-out connection that allows you to connect it to an HDTV so you can watch videos, play games, etc. I have a Dell M1530 that I regularly connect to my Samsung LN40A750 via HDMI to get stunning video output. My laptop used to run Windows Vista and the desktop fit perfectly on screen with no overscanning issues. However, after upgrading to Windows 7, I noticed that considerable amounts of my desktop was being chopped off!
I searched and searched online for a similar issue and could not find any results – probably since Windows 7 is so new. I downloaded to latest Nvidia GeForce drivers but still no luck. I tried changing the refresh rates of my video card but that still did not work. Almost ready to give up, I decided to go through my TV menu options for anything that might make a difference. Voila! I found a picture mode setting that was set to 16:9 and I changed it to Just Scan and that fixed the issue. No more cut-off screen!
I hope this article gives you some ideas to try out and fixes your problem. If not, post some information as a comment and maybe someone will be able to help you out!