Overclock? Turbo? Huh?

Try updating your drivers, that's all I can suggest with limited information.

http://www.worldstart.com/tips/shared/updatingdrivers.htm

Regardless, you should be able to play Black Prophecy just fine with the laptop you have now.

I'd focus more on getting a mouse and a desk to play at. You won't be able to play effectively sitting on the couch.

Don't put too much faith in windows experience index to be honest, and no I doubt there is anything wrong with it.