Hey Cadwell. Mostly this is the result of having some sort of Anti-virus security system on a computer because what happens is that the program doesn't understad the signal that iTunes requires in order to communicate with the apple servers so it cuts it off. if you do not have a anti-virus security system, it could also be a resulkt of a time out error from your internet speeds not being fast enough. You can test your internet speed at speedtest.net. For the best results, you would want as a recommended minimum as the results below:
PING: 20-150ish ms
Download Speed: 3-7mbps
Upload speed: 1-5mbps
Although this is mostly wildly affected from download speeds. If the issue is with the internet speeds it would be good to consult your ISP (internet service provider).
If iTunes remains frozen you could quit and try again by starting your windows task manager by holding control, alt, and delete!
Worst comes to worst, you could follow this instruction to remove iTunes and related components, and reinstall it. This will not affect any information you may have in iTunes.
Windows Vista & 7 -
http://support.apple.com/kb/HT1923
Windows XP - http://support.apple.com/kb/HT1925
