|1704 - An installation for  is currently suspended. You must undo the changes made by that installation to continue. Do you want to undo those changes?|
This error message will occur if the key "HKLM\Software\Microsoft\Windows\CurrentVersion\Installer\InProgress" exists.
The most likely reason for this existing is an unexpected reboot (or Windows Installer crash) occured in the middle of the install. If this is a persistent problem that keeps reoccuring then turn on verbose logging by policy to capture the problem occuring.
Microsoft's KB312308 article says to remove the above mentioned registry key, but I suspect you can probably restart the installation of the problem product instead.