Is There A Program That Allows You To Play Mp4's On Your Computer?

I personally recommend using the Combined Community Codec Pack (CCCP), as it covers just about all the playback codecs you should need, as well as including two different media players, if you want nice, simple playtback. With it installed, you should have no problems playing .avi, .mp4, .mp3, .ogg, .mkv, .mov, and an outrageous number of other file types you most likely will never encounter, but if you do, it will play.
The codec pack installer can be downloaded here, and is free of charge.
I hope this helps, and you have a great day.

You need mp4 player in order to run mp4 file in your computer. If you are looking for free software then go to www.download.com and download the desired software for free or click here.

If you cant able to install Mp4 player then go for  VLC player.

Enjoy blurting :)

I personally use GOM Player. It is very easy to use and is customizable to ones need. I can play a large variety of files and is compatible with windows Vista.

www.gomlab.com