MSI 1327: Invalid Drive – Fixing Broken Shell Folder and Mapped Drive Paths
Error 1327 means a shell folder or install path still points at a drive letter that is gone. Repoint the registry values or remap the drive, then retry.
Kaspersky install error 1721 and 1327: setup fails on this Windows machine
Kaspersky error 1721 stops installation when Windows Installer or a rival antivirus gets in the way. See the cause and the clean install route.