Har ett flertal gånger försökt at installera IIS men stöter bara på problem

På localhost får jag detta felmeddelande
"Server Application Error
The server has encountered an error while loading an application during the processing of your request. Please refer to the event log for more detail information. Please contact the server administrator for assistance."

I loggen får jag detta
"Servern kunde inte ladda tillämpningsprogrammet /LM/W3SVC/1/Root. Felet var Klassen har inte registrerats"

Hittade detta som har hjälpt en del, men inte mig
jag får felmeddelande
"DllRegisterServer i asptxn.dll misslyckades. Returkod: 0x800800005"

a) Delete IIS related package in Component Services MMC
• IIS In-Process Applications
• IIS Out-of-Process Pooled Applications
• IIS Utilities

b) Open command prompt, navigate to %windir%\system32\inetsrv folder, and enter (case sensitive)
c:\winnt\system32\inetsrv\>rundll32 wamreg.dll, CreateIISPackage
then
c:\winnt\system32\inetsrv\>regsvr32 asptxn.dll

c) Enter IISRESET at command prompt to restart IIS services, then re-open Component Services MMC to verfiy the IIS packages are recreated.