I've launched ...\framework\v4.0.30319\aspnet_regiis.exe -i and in the error log it seems to be trying to find the following key and failing:
Software\Microsoft\ASP.NET\4.0.20506.0/DllFullPath
There is an entry the registry for Software\Microsoft\ASP.NET\4.0.20506.0 but no DllFullPath, besides, I'm trying to install v4.0.30319. Anyone know what the correct fix for this is? I don't want to go and blast Software\Microsoft\ASP.NET\4.0.20506.0 willy-nilly.