I am having an issue with quicktime and its annoying me..

I am trying to play a video from my algebra book that works out the problems for me so I can see what to do. Well.. it was working just fine last semester and now no audio is playing. I get audio with iTunes and everything else.

I removed and reinstalled quicktime with no improvement, all drivers are to date(all automatic update)...


I also need a new laptop.. I have yet to commit to buying a new one.. I like having money in my account but not spending it. a problem