This is almost always a setting in your TV. TVs overscan the television image because older TVs couldn't display truly edge-to-edge (CRTs corrupt the edges of the screen, and cover it up with a plastic bezel). Because many standalone components expect this (and will otherwise show black bars all around the content on the screen), HDTVs often come preset with an aspect ratio setting that crops off the outer edges of the images they get.
The graphics card drivers also probably have an overscan setting which can solve this., but don't use it if you can help it (keep it at 0% scaling). That lowers the effective resolution of your panel (it displays windows "smaller" than the full resolution of your monitor).
Instead, look in the settings on your TV itself for Aspect Ratio settings. Hopefully, you have a proper setting to not crop. Look for a 1:1, Full, or True setting under Aspect Ratio. On newer Samsung's it is harder to find, but it is in there somewhere (look under Advanced settings and try things that might make sense). With luck, the setting will be input-specific, and it won't screw up your other devices (if any).
Settings like 16:9, Zoom, Crop, and other similarly named things often scale the image, which you don't want. But they're named funky, often. On a couple Panasonics I have at the office, the "proper" setting is called "Zoom 2", so you never know. Anything Aspect Ratio related that you aren't sure about, just try.