If you have problems with video playback
Codecs
Some necessary codecs are requested in the conversion jobs performed by our program. And also, after certain conversion jobs are done, they are required in the playback of final output files.
We would like to recommend K-Lite Codec Pack. It is pack of most popular video and audio codecs in one install. Once, you install it you can forget about any video and audio codecs problems.
You can download it here:
http://www.free-codecs.com/download/K_Lite_Codec_Pack.htm
Video players
We would like to recommend VLC player. It is very compact and it comes video and audio codecs also.
You can download it here: http://www.videolan.org/vlc/download-windows.html
Here are some other players:
QuickTime Player
http://www.apple.com/quicktime/win.html
iTunes
http://www.apple.com/itunes/
Winamp
http://www.winamp.com/player/
Windows Media Player 10 upgrade
http://www.microsoft.com/windows/windowsmedia/mp10/default.aspx