You should let us know what type of LCD you actually own. You basically are saying "I own a car, and it doesn't work right, what am I doing wrong?"
Always provide full information: Make & model as well as any specifics about connections. ie: HDVI is not a correct term. You either have HDMI or (more likely for this setup) DVI, between the PC and the LCD.
What you typically want to do has already been stated: Right click on you PC desktop and choose 'PROPERTIES' go to the SETTINGS tab and adjust your resolution for the new LCD display so it matches the native resolution of that display.
For example, if your LCD display has a native resolution of 1365x768, then you want to adjust your PC output so that it is delivering 1365x768 to your display.
More info! More info!