I have so many issues I don't know where to start. I have an i3 with Nvidia GeForce 840M. But: I'm running Linux. I do have oclvanitygen working on my GPU, but it took a lot of fiddling to get it right.
I'm running Windows 7 in VirtualBox, so I don't think it can use my GPU for mining. It would be nice to get it working though.
So far I've only used CPU-mining for Nobtcoin (command line minerd on Linux), no other mining ever.