iTunes says that it is an unknown error when connecting to the iTunes store.
That's an error from iTunes. Try reinstalling iTunes and Quicktime.
itunes error 13010 refers to a corrupt itunes library genius file -- to resolve it remove the "itunes library genius.itdb" from your itunes folder and relaunch iTunes
Update Mac OS from the apple icon in the top left corner of your screen, then go into iTunes and update available Apps. From the iTunes menu bar select Store and then turn Off and then On Genius. If not repaired, reinstall iTunes.
it means an error has occored in your computer
The fix is to run itunes as administrator
4001 = MMMMI
No, 4001 is not a multiple of 100.
iTunes error code 4550 is an error that occurs when trying to burn music to a CD. One common fix is to try burning onto a different CD.
4001/1000 = 4.001
i have the same problem and its just the internet con't connect to the itunes store.
iTunes could not connect to the iTunes Store. Maybe your Internet is off. Maybe you have a firewall that is not letting iTunes connect. Norton is vary difficult to set up for iTunes.