In device manager, display, roll back the drivers to the previous ones.
However, when i started to play a game (Neverwinter) which i could play almost at full blast in graphics (the only thing i lowered was anti-aliasing), it stutters and slows down dramatically in big group situations (a lot of npc/other players) or when al lot af action is happening in my screen.
If this only happens in areas with lots of other players onscreen, then the issue is not related to the graphics card at all. This is a CPU bottleneck occurring and happens even in high end systems. The CPU is having to label all the other players on screen and track their positioning as they move around in relation to you moving around. In doing so, this introduces slowdown in the form of much lower frame rates in the in-game towns.
Anyone who plays MMOs would know exactly what I'm talking about.