IIS 5.1 "The specified procedure could not be found."

IIS 5.1 raises an
127 "The specified procedure could not be found."
error when attempting to start the WWW service on a Windows XP SP2 machine.

I also have a working instance of IIS with the same configuration.

I used the depends.exe to analyse the difference between the working and the non working instances.

The file infocomm.dll should have the version 6.0.2600.2180 ( the non working instance had a lower version )
which seems to be the correct file version shared by all files in SP2.

The service was able to start once i had this version installed.

Please note: reinstallation of IIS did not solve the problem, which might indicate it justcopies whatever is present in the cab files and these are not from SP2.

Thanks to David Wang for the tips here which helped me to resolve this.