I have seen reference to turning Anti-aliasing off since I have an NVIDIA graphics card, but that does not seem to work...

This is what someone else said, but it did not work for me so far:

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[solved - GOG support suggested problems with Nvidia drivers, and yes, there was a general antialiasing option turned on on my system. Turning it off for EEAH solved the problem and the game is playable now]

I cannot play the EEAH game - when I start it in Windows, I get to the main menu, with mouse cursor sitting in the top left corner. Any movement of the mouse, and the cursor disappears and only Ctrl-Alt-Del works. NO SOLUTIONS posted herein before work for me (changing screen or mouse resolution, backward compatibility, core affiliation etc.). The same happens for USB and PS/2 mice alike. Any help will be greatly appreciated as I purchased the game and cannot play it (and GOG support seems non-existent in this case - holidays?).

Many thanks in advance,

pfs.

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Any help anyone can be would be great

You need to ALT+TAB. You'll see that there is a prompt to permit EEAH/EECH through the firewall.
Once you permit or deny this, ALT+TAB back and the game will begin responding.
After this it should "just work".

If you have trouble ALT+TAB'ing, you can manually add EEAH/EECH executables to the firewall via windows settings.

Nice one!
I gave up on this from the moment i installed it.
Amazing how a simple security check disabled it