VLC is my backup of choice as wellKMPlayer is also not to bad, but CCCP bundles MPC and that handles most of my playback for me.
CCCP basically just integrates with Windows very well for me - not only for video playback, but when I use programs like Adobe's Premier Pro and AfterEffects as well - with KLite I had issues importing video files to the applications.
Since I'm here I may as well add in one or two more:
If you have DVD playback issues due to Region restrictions (VLC takes care of it sometimes, but not always) handy little app called DVD43 sorted me there - decrypts DVDs on the fly, and it basically just sits in the background until you pop a DVD in the drive:
http://www.dvd43.com/
OpenOffice - my productivity suite of choice if you don't have MS Office - it's completely free, and OO3 is a significant step up from version 2. You can pretty much do anything with it you can do in the MS Office Suite
www.openoffice.org/
Any-Video-Converter and Any-Audio-Converter - some lightweight, but pretty robust tools for converting video and audio files between various formats. The Video converter will download Youtube files for you as well.




KMPlayer is also not to bad, but CCCP bundles MPC and that handles most of my playback for me.
