I open the launcher to do the patch, wait about 15 mins and then it stops and comes up with a message saying WoW folders are damaged.

I open my wow folder and open the repair, but when I try repairing it comes up with a message saying you cannot repair while world of warcraft is open. when its not the only programme open is the repair. I can't even get on WoW because the patch that I cannot do.. help please....