I had actually forgotten about this but recently had to re-install Land Desktop myself and I figured it was worth sharing. This method is not guaranteed but it just might work.
Instead of trying to install Land Desktop from the original DVD, try copying the contents of the DVD to a new folder on the hard drive of the Windows 7 machine. Then, run the installation from there by clicking on the Setup.exe file.
I haven’t tried this with anything newer than Windows 7 but it worked flawlessly on my Windows 7 64 bit computer.