Replay Video Capture uses some elements of Windows Media Player. If you are using a KN or N version of Windows, Windows Media Player components might not be installed. Please go to the Replay Video Capture program folder and run the ReplayVideo.exe file. If you get an error about wmvcore.dll being missing, then you will need to download and install the Media Feature Pack from Microsoft.
Windows 7: http://www.microsoft.com/en-us/download/details.aspx?id=16546
Windows 8: http://www.microsoft.com/en-us/download/details.aspx?id=30685
Windows 8.1: http://www.microsoft.com/en-us/download/details.aspx?id=40744