free file converer?

if you want to convert them so you can put them on a dvd you can just use dvdflick which can convert any type of video files and make them into a dvd image complete with a menu.

if you just want to convert some stuff to mp4/avi you will need something else
 
Handbrake will convert to MP4 very quickly and efficiently, and is multi-threaded (will use all your cores). That said, why not just watch the MKVs? Media Player Classic Home-Cinema will play them no sweat, and features DXVA hardware acceleration too.
 
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