Having trouble isntalling itunes 5?

[Goosemaster]

1. Right click on "my computer" in the start menu
2. Click on "Manage"
3. In left hand panel click on "Services and Applications"
4 Then in the right hand panel double click "services"
5. Scroll down and make sure that the four following things are running and are set to automatic: 1) TCP/IP NetBIOS Helper 2)Windows Management Instrumentation 3)Windows Management Instrumentation Driver Extensions 4)WMI Performance adapter.
6. Make sure all 4 of those are running and set to automatic
7. Restart the computer.
8. After the restart, disable Norton internet security
9. Download the new itunes installer and run it.
10. This should work. Or at least it worked for me.