VLC media player will player most types of files on your computer, MP3s, MP4s, music and video.
It comes complete with a full dashboard of controls that includes zoom - brightness - contrast and a graphic equaliser.
VLC is open source and completely free. I can vouch for its reliability, I have been using VLC for more than three years now, especially when windows media player fails to open files, as I am finding more and more often.
VLC can play your CDs and DVDs without any issues regarding DRM or conflicts between your video card and computer (I haven't had this problem once with this program).

Safety is always paramount when online, so the link to the program is from a reputable source, (which will be posted in it's own right later) downloads.com
Rather than just providing a mirror link to somebodies webspace, I would recommend going through a trusted website.

to date, more than 19 MILLION people have downloaded the VLC media player from the linked website above.