Anyone else running into my issue I was able to resolve it by entering the following command into an elevated prompt:
"dism /online /enable-feature /all /featurename:IIS-ASPNET45"
The last line:
powershell -command "enable-windowsoptionalfeature -online -featurename iis-aspnet45 -norestart;"
Was the culprit.
Not sure if it's just my system but the web interface is now able to load.