You will get this message if the dll installer is unable to copy the dlls to SYSTEM for any reason. The most likely reason is that a program using the dlls is currently running and so locking the dlls and preventing overwriting but it could be other problems such as folder security settings or read-only files

The installer is a self-extracting zip executabe so if you have winzip or winrar (or 7zip or any other archiving tool) you should be able to right-click on the installer file and extract the files so you can then copy them manually to your SYSTEM folder. At least when copying manually Windows should give a bit more information if it flags an error