Ich hab das hier mal im I-net gefunden, Quelle:
Hier
Text:
1) Open the Windows Registry by clicking on the Start button. Then select "Run". In the Open field, type in "regedit" and then press the OK button. This will bring up the Windows Registry.
2) The WIndows Registry is somewhat similar to Windows Explorer in that you can expand folders. First, you will need to locate where in the registry your graphics card information is stored at. To do this, navigate to HKEY_LOCAL)MACHINE -> Hardware -> DeviceMap -> Video
3) On the right panel, you will find several registry keys. Double click on the key labeled "\Device]Video0". This will open up a new windows. In the Value Data field, you will find a long string which ends with "0000". Before these numbers, you will find a long string that is in between curly brackets { }. Copy the string in between the curly *Z*ets into notepad or any other blank text document file for reference later. Then click on the OK button to close the edit string window.
5) Click on the "Edit" menu button within the Windows Registry and choose "Find". In the "Find what" field, paste the string from the "Video0" key that you copied into your notepad. Then click on the "Find Next" button. It should stop once it finds the folder with this name on the left column. If it doesn't and stops on a registry on the right side instead, choose "Find Again" to have it continue searching until it stops on a folder with the same name.
6) Once it finds the folder, double click on this folder to expand it. Beneath it, you will find 3 folders. Left-click on the folder labeled "0000". This will show this folder contents on the right column. The list of registry keys is very long. Scroll through the list until you find "NV_Modes" and double-left click over this to edit this value. The values may look scary but don't worry. Start on the first line and search for "SHV". Right after "SHV", type "1680x1050x32=1;" (don't forget the semicolon after the "1"). Make sure there is a space right after SHV and the value you added . After you have done this, click on the OK button and then close the Windows Registry.
7) Restart Windows and then after you are back, see if the resolution is added to your list in the display properties.