Wireless Keyboard and Mouse KM632 media keys not working!

Had this keyboard with my Inspiron One 2330. It worked fine until Installation of Windows 10 messed up my computer. The computer was fixed thanks to Dell but the keyboard media keys (Play, skip forward and skip back) have stopped working. It isn't a major issue but use them a lot for skipping music tracks.

Please can someone advise me on how I can fix this problem. Have searched google but have yet to find a solution to my problem.

Thank You :)