Rougechicken Uh... If Cosmoteer was being blocked by an antivirus, it wouldn't launch in the first place. Also, it is obviously installed correctly, otherwise it would be pointing to a mod.txt error (nearly always not being able to find the mod.txt). Not to sound rude or anything, but perhaps you should actually take a closer look at the error to see what is wrong, instead of just speculating?
Coops2113 Halfling.ObjectText.OTParseException: Group at path '<C:\Program Files\Cosmoteer\Data\ships\terran\control_room_small\control_room_small.txt>/Part' already contains a node named 'CrewCapacity'.
This immediately narrows it down to two options. Either, the mod in question tries to add "CrewCapacity" instead of overriding it, or two different mods are trying to add something to the same part. Now, the control room already has a crew capacity, and none of the example mods really touch the control room, so I can say almost for certain that it is a broken mod, like Jared said
