Hi ,
Can you post your dxdiag? Additionally, have you reported your crashes and errors on the answerhub at http://answers.unrealengine.com? If not, please make an individual post for each different crash and error, in the crash posts, include your crash logs, callstack, dxdiag, and any reproduction steps that could help us to recreate this on our end. For posts regarding non-crash errors, please include your dxdiag as well as reproduction steps to recreate the error on our end. This will help us to better assist you with these potential bugs.