Thanks for your replies. I will try the script out. I've seen it metioned in the forum before but never remembered to set it up as I rarely use any scripts!

When I'm on the PC I'll experiment with the graphics card settings and two installs.

On my laptop, I've now got two instances running. One is from the original MoI.exe in the MoI 4.0 folder, and one from a clone called MoIC.exe running from a duplicated folder called MoI 4.0C. I even changed the shortcut icon to launch the clone to the old Windows Fax Service icon, as after all that made clones of documents! It may be enough to fool the Nvidia settings.

Thanks

Andrew