ok, right click the desktop go to properties, Settings tab.
you should see 2 monitors like i have in the pic. The primary one should be your laptop lcd, you want to click on the 2 box (see where mine says not active, since I'm using only one screen. Yours should be active and clickable. Alternatively you should also be able to select the second monitor from the dropdown box right below the schematic.) It will show the resolution for that monitor, make sure it's set to 1920x1080.
http://img851.imageshack.us/img851/1210/resolution.png