If you need to deploy an MSI file through GPO by using User startup/login script and the MSI needs to have administrator rights, use the following Run As and Sanur:
runas /user:DOMAIN\account-with-admin-rights "msiexec /i The-File.msi /quiet /log c:\the-log.log ALLUSERS=1" | sanur password-for-account-with-admin-rights
