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?
I am having the exact same issue except i am on a PC. I called apple and apparently the issue isnt in their "database" and they have no solution for us. I was told to call microsoft to see if it was a operating system problem. Now i need to pay to customer support at the chance that they wont even fix the problem.
If the problem is with a particular streaming radio station then it probably exists at the broadcaster's end and there may well be nothing you can do to fix it.
If you suspect you iTunes installation may be faulty then for general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach.
Review the other boxes and the list of support documents further down the page in case one of them applies.
The further information area has direct links to the current and recent builds in case you have problems downloading, need to revert to an older version or want to try the iTunes for Windows (64-bit - for older video cards) release as a workaround for installation or performance issues, or compatibility with QuickTime or third party software.