Let's try a non registry approach, since the registry way isn't working. Do you know how to manually install a driver? Open device manager and double click on your monitor. Go to the driver tab and click update driver. Click browse my computer... Click let me choose... Click have disk. Click browse and browse to c:\windows\system32\driverstore\filerepository. In there you should see a folder called monitor.inf (the actual name might be longer than that, but monitor.inf will be in front), open that folder and and select monitor.inf, then click open. Click OK and then click next. That should install the generic pnp monitor driver for you.