Having these IIS issues

[BongoBuddy]

Hello DevBest,
I am having a problem when trying to install IIS. You can view the problem by clicking

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I am using IIS 8 (on a Windows 2012 server of course) and used @RyanzRetros tutorial but he didn't know the error. Any responses of help would be appreciated, thanks.
PS: Ryan recommended @JayCustom and @Janzeer
Thanks,
-Undecided.

 

[Rain]

Try re-installing. 500 errors can also be caused by the web.config having incorrect code, so check that