I suggest using Media Player Classic
To avoid problems, don't install any "Codec Packs" if you are not savy to audio/video media file types and their associations with the handling of codecs and filters. You should only install components that your media handler specifically prompts you to install, thus eliminating incompatibilities down the road.
However, I do recommend downloading and installing a few codecs right after your initial installation of MPC. Real Alternative
: Enables MPC to handle files associated with RealMedia. QuickTime Alternative
: Enables MPC to handle files associated with QuickTime. AC3 Filter
: Decoder that supports the following audio formats--> AC3 / DTS / MPEG Audio.
With these additions to MPC, the most popular media formats are able to play in just this one Media Player. If you try a format that is unable to render, try to find a codec or handler for that particular file type at a site like Free-Codecs.com
or search Google for the file type, and learn what you can about possible options.
Lastly, when performing the installation of the files I have recommended above, consider taking these steps to simplify future handling of these files.
1. Create a "New Folder" named Audio-Video
in the directory that contains your Program Files. example: C:\Program Files\Audio-Video
2. Install MPC, Real Alternative, QuickTime Alternative, and AC3 Filter in this new folder, as well as future additions of files associated with MPC. This step makes life easier in case of problems with future add-ons, codec incompatibility, and so on. NOTE: During the installation of the Real and QuickTime Alternatives respectively, you will be presented with the option to install Media Player Classic. Untick the option in both installations, The new MPC version came out just today, so that is the version you will want to install.
Hope this helps,