@littleotter69,
Does your video card support/have shader 2.0? It has to have this or better.
My son had a 7600 series GeForce and it was not sufficient to play even Rise of Mankind Mod much less C2C. Sorry but you need a better vid card.
I just upgraded from a ATI Radeon HD4650 with 512MB of DDR2 that up thru v18 had had no problems with C2C. But with the new terrains in v19 it started to have problems. I went to a MSI R6450 with 2GB of DDR3. NewEgg has it for $59.95. There are other makes that are cheaper that will work. But the shader tech must be 2.0+(3.0 and better is recommended) and it doesn't hurt to have 1GB (or more) on board video ram.
JosEPh