All Music & Videos stop working on Macbook Pro

I've had my 15" Macbook Pro for 6 months now. If my Macbook has been on for a while, at some point all media randomly stops working; when Quicktime tries to open a file it opens it partially and freezes at the "loading movie" sign. If iTunes is already open before this problem occurs, it will work fine, but if I close iTunes & try to open it again it will crash and I'll have to force quit it. Videos and music in web browsers such as Firefox and Safari either won't work or causes the browsers to crash. Along with this programs like Photobooth crash. The only hint I've got to what's going on is that when I open After Effects after all this happens it freezes upon opening whilst "initialising Media Core," and Sibelius does the same whilst "Initialising Playback System"
So I'm guessing there's something wrong with my Macbook Pro's "media core"/"playback system".
The only way to sort this problem out is to log out & log back in again, but after a while the same thing happens and all media stops working. Having to close all my applications to log out and log back in again can get really annoying. This problem started about a month or so ago and I have no idea what triggered it or how to fix it.
I was wondering if anyone else has encountered this sort of behaviour with their Mac and know how to fix it?
Thank You.

I would try some basic repairs and see if that helps.
Try using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk.
You could have some directory corruption. Let us know what errors Disk Utility reports and if DU was able to repair them. Disk Utility's Disk Repair is not perfect and may not find or repair all directory issues. A stronger utility may be required to finish the job.
After that Repair Permissions.
No need to report Permissions errors....we all get them.

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