hey, i was having the same problem with AIM 6.5.
here's a solution to the MP3 problem that i found on another website:

"1) Go to control panels

2) go to the "sound" control panel


When you click on it and open it, you will instantly get some kind of an error message about some ridiculous problem, and you can choose to Allow or Disable.



CHOOSE DISABLE."

Instantly, my iTunes was fixed.
I'm still trying to find how to fix my wireless access and antivirus problems from AIM