The malware-gen detection is buried deep inside of an archive file 4cc1c.msi (which is a bit of a weird installation file name and no hits on a search for it) in the C:\Windows\Installer\ folder. Trying to remove it from within the archive could result in the corruption of the archive, which is why you get the ‘operation is not supported for this type of archive’ error.
That said I still believe that C:\Windows\Installer\4cc1c.msi archive file with the suspect file inside is suspicious in its own right.