delete a project (Cocos2dx)

I have a problem to delete a project in my project folder. I always get the message "An unexpected error is keeping you from deleting the folder. error 0x80070091: The directory is not empty". So what should I do to delete that folder?

Windows 8

I solved it!

It's very simple. I downloaded a third-party tool called "Unloacker" and after installation I was able to delete every corrupted file on my PC including those project folders.

Link:http://www.emptyloop.com/unlocker/