cent is one of the easiest to install
what is your hardware ? this sounds like your 3d card might be the problem
how much ram ?
the cpu ?
your 3d card ( if you have one)?
if not the built in chip on your MOBO ( if you have one ) ?
also for a very new user i would recommend installing Ubuntu or mint
cent is targeted for the office and can be a bit hard to get some new things installed