I am trying to install Windows Defender. I downloaded the SW but during
install I received an error message that i needed to update Windows Installer
3.1. I downloaded this, but during install I get the following error
message. "Setup could not verify the integrity in the file Update.inf. Make
sure the Crytographic service is running on this computer." I have replaced
the file NT5INF.CAT but this hasn't helped.

Need help to get the installer loaded.