Can not add files to library

I upgraded to IT7 and after i installed the latest version of Quicktime for a second time it finally worked. But now i can´t add new songs to my library. I use EAC to convert WAV to MP3 and I store them on my external harddrive. Does anyone encounter the same problems or has anyone a solution to this problem?? Thanx

Initially, I got an error message saying that the those componants (that import and burn cds) could not be installed due to a third party software. So I just clicked on iTunes set up and selected repair. The problem was fixed right away. Granted, my error messge told me to re-install iTunes. So try just running a repair from the set up instead of re-installation. Otherwise you might just end up re-installing the same problem.