Ghost Recon's main menu is hard coded at 640x480, to get it to run on monitors that do not support this resolution you need to run in windowed mode.
- Locate the file "options.xml" in the root GR directory.
- Open it with any text editor
Now find the line
<FullScreen>TRUE</FullScreen>
and change it to:
<FullScreen>FALSE</FullScreen>
There is a full discussion in this issue HERE.