what format are the video files mp4? any files you have converted with freemake should be OK
it's actuaally a good esy program just a pity it comes loaded with crapware in its install file and update files.
To Uninstall just right click the Freemake file in the start menu and select uninstall.
To change the default program from Freemake to the video player of your choice just follow the instructions click here