Hello Rolly,
Thank you for posting your query in Microsoft Community Forums.
If the drivers for “Microsoft Wireless Multimedia Keyboard 1.1” for Windows 8is not available. I would suggest you to install the drivers in compatibility mode and check
You may download and install the Windows 7 drivers in compatibility mode.
Refer to the link to download drivers:
http://www.microsoft.com/hardware/en-us/d/wireless-multimedia-keyboard
Refer to the articles:
Make older programs compatible with this version of Windows
http://windows.microsoft.com/en-US/windows-8/older-programs-compatible-version-windows
What is program compatibility?
http://windows.microsoft.com/en-US/windows-8/what-program-compatibility
Hope this information will help you.
For any other Windows related issue, reply to us and we will be happy to assist you.