HELP crashes when refreshing index and playing games and its a new com


Dec 15, 2011
Hey there I am ne wto this community but here is my problem,
I Have brand new computer (Gateway FX series) Windows 7 64bit, Intel Core i7 processor 2600, 8GB DDR3 Memory, Raedon 6870 HD graphics card.
My problem is when went to test it out on a simple easy to run game Rome Total War it crashed and that is all it does. So tell me is there a way to make sure I have drivers installed and directX. An if there is anything else i need to do. Please help and thank you if you do.