There are some differences between Windows 7 and Windows 7 Service Pack 1, and the more important one is the update pack. It's possible that a feature or a certain function to be available only for the Service Pack 1. As far as I know, the Service Pack 1 is free to download if your Windows is activated. Go to Start > System and Security > Windows Update > Check for Updates. Make sure you are connected to the Internet them check for updates and apply all the available ones. reboot the PC and the error message will disappear.