I did the reinstall and had to reinstall latest version of itunes as well to access the application. I have the same error message.
This is maddening.
BTW I can access itunes from my devices. ios 7.02 iphone 5 and my ipad mini ios 6.
I have tried disabling them also .
Can anyone help with this?
The error message is -54. It keeps telloing me to check my network connections.Connections are fine.
Advanced iTunes Store troubleshooting
Retrieving data ...