Mearly trying to help him in the long run.
but if he really does persist what brand and modell GPU unit are you using?
Is there a spesific error message ?
does this only occur with this game or does it also happen with any newer modell games ?
MY first fix issue would be to track down the most uptodate and perhaps non beta grpahics driver for your GPU. The issue with 64 bit systems is that you need spesific 64 bit drivers. The Unreal 2.5 engine that RO runs on does have support for 64 bit so shouldnt really be a game issue.
My bet would be that you are perhaps running a GPU that does not have good 64 bit support or that you drivers are just old.