Can't quit iTunes 7.5: immediately relaunches
Screencast is at http://screencast.com/t/QKD5VDRliR
I did an "archive and install" upgrade from 10.4 to 10.5. I didn't have any problems with iTunes. However, I was having problems connecting to my school's 802.1X network, so I reformatted my hard drive and did a clean install of OS X 10.5, then got all available software updates.
I tried downloading iTunes from apple.com and running that installer; same result.
2.2 GHz MPB
2GB RAM
OS X 10.5.1
2.2 GHz MBP, Mac OS X (10.5.1)