MSI Killer network is killing me

I just did a new build for my brother in-law and I'm having huge problems connecting it to the internet.

MSI Z87-G45 board

 

I tried downloading the newest driver from the MSI website and it's not helping.

 

I keep getting errors and I don't think it's chrome. My internet is super slow right now.

 

Any ideas on fixing it?

 

Does this happen for all websites?

I unstalled/reinstalled and it's gotten better.  I still can't use http://www.curse.com/client   

 

It comes up with that error 

That's weird.  Is it with the addon installed?  I'm not too sure on what's going on, as the specifics of the things that you did leading up the problem are sparse.