Windows Installer keeps trying to run AcroPro.msi

[Derek2k]

Can anyone advise please why I keep getting a message pop-up that says that Windows Installer is trying to run AcroPro.msi, for no apparent reason. It comes up every time I right-click on a folder in File Explorer to bring up the file menu, the menu doesn't appear until I cancel the message. The message is below, it says it's unavailable because I renamed it AcroPro.ms_ to stop it going into install mode which takes ages to exit from.

Thanks.