Close your iTunes,
Go to command Prompt -
(Win 7/Vista) - START/ALL PROGRAMS/ACCESSORIES, right mouse click "Command Prompt", choose "Run as Administrator".
(Win XP SP2 & above) - START/ALL PROGRAMS/ACCESSORIES/Command Prompt
In the "Command Prompt" screen, type in
netsh winsock reset
Hit "ENTER" key
Restart your computer.
If you do get a prompt after restart windows to remap LSP, just click NO.
Now launch your iTunes and see if it is working now.
If you are still having these type of problems after trying the winsock reset, refer to this article to identify which software in your system is inserting LSP:
iTunes 10.5 for Windows: May see performance issues and blank iTunes Store
I have a MacBook Pro. On iTunes I have Armitage's Dimension and Classical KING FM (Seattle) in a playlist. KING FM will play. Trying to play Armitage's Dimension produces a dialog box "connecting" to URL, but never connects and finally stops. For most of the time when the dialog box is open, I cannot leave iTunes or even quit iTunes. Anyone?