If you go to the RO Support forum you may get a little : support

.
First thing to do is verify your RO game cache.
Open Steam, go to My Games, right click on the RO icon/ properties/local game files/ verify integrity of game cache....
Steam will validate and update if needed !
System specs and are you able to run other games through Steam ?
See yer later !
Move this over to support please one of you yellow/green people !
Thanks for the Tanks...