[Thermopyle]

Right rant over can someone tell me if, when you've installed the spearhead game you can still run mohaa or does it alter the mohaa.exe.

Yes, you can still run MOH:AA; it does not alter mohaa.exe.

will you still be able to go on servers running MOH:AA without spearhead?

You can get to them through MOH:AA. I dont know if you can get to them from the Spearhead in-game browser or not.

Can you use the new spearhead weapons and skins with the old maps?

Yes, if the Spearhead server is running the old maps. And its pretty cool, although I dont believe there were many Russkies charging the beach on D-Day, but then again, I'm not a historian.