This was posted somewhere else and worked for me with my three monitor setup. I have two monitors connected via DVI and an identical one connected via the VGA port. The VGA monitor never seemed to get its native resolution in Windows 7 so I performed the following steps.
Download and unzip the attached file.
Edit the INF file with notepad according to your appropriate monitor name/resolution where you see such settings.
1. Go to your MONITOR (not
DISPLAY -- probably showing as generic) in Device Manager.
2. Update the driver
3. Select to browse for the driver file.
4. Browse to where your edited .inf file is saved.
5. Select & Install it.
It should now show correctly, or at least allow you to reset the resolution to the appropriate resolution.
The attached .inf file is set for my LG monitor but you can change all of this when you edit.
I see this as a quicker, more standard way of correcting this issue without having to dig around in the registry.