What is WGASETUP.EXE

I have blocked this program and need to know what it is? I think I have been hacked and Phished and then this popped up so I blocked it. Is it a program I need? I am at my wits end trying to figure out everything that is going on. How do I get rid of a hacker? I think my Mcafee product has been corrupted as well.
Thanks for any help! Please reply ASAP!