ITunes locks up when trying to log another user out of the store.

Question

Running Windows 7.  System restart is all that will allow me to re-open iTunes.  Running a diagnostic check indicates that the store cannot communicate.  Results of that follow:
Microsoft Windows 7 x64 Business Edition Service Pack 1 (Build 7601)
Hewlett-Packard HP Elite 7100 Microtower PC
iTunes 10.5.2.11
QuickTime 7.7.1
FairPlay 1.13.37
Apple Application Support 2.1.6
iPod Updater Library 10.0d2
CD Driver 2.2.0.1
CD Driver DLL 2.1.1.1
Apple Mobile Device 4.0.0.97
Apple Mobile Device Driver 1.57.0.0
Bonjour 3.0.0.10 (333.10)
Gracenote SDK 1.9.5.502
Gracenote MusicID 1.9.5.115
Gracenote Submit 1.9.5.143
Gracenote DSP 1.9.5.45
iTunes Serial Number [redacted]
Current user is not an administrator.
The current local date and time is 2012-01-18 20:13:46.
iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is not supported.
Core Media is supported.
Video Display Information
Intel Corporation, Intel(R) Graphics Media Accelerator HD
**** External Plug-ins Information ****
No external plug-ins installed.
iPodService 10.5.2.11 (x64) is currently running.
iTunesHelper 10.5.2.11 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name:          {34514AC4-8B99-438B-923C-E2C96131C81C}
Description:          Realtek PCIe GBE Family Controller
IP Address:          [redacted]
Subnet Mask:          255.255.255.0
Default Gateway:          [redacted]
DHCP Enabled:          Yes
DHCP Server:          [redacted]
Lease Obtained:          Wed Jan 18 20:08:05 2012
Lease Expires:          Wed Jan 18 20:08:04 2012
DNS Servers:          [redacted]
Active Connection:          LAN Connection
Connected:          Yes
Online:                    Yes
Using Modem:          No
Using LAN:          Yes
Using Proxy:          No
SSL 3.0 Support:          Enabled
TLS 1.0 Support:          Enabled
Firewall Information
Windows Firewall is on.
iTunes is NOT enabled in Windows Firewall.
Connection attempt to Apple web site was successful.
Connection attempt to browsing iTunes Store was successful.
Connection attempt to purchasing from iTunes Store was successful.
Connection attempt to iPhone activation server was successful.
Connection attempt to firmware update server was unsuccessful.
The network connection timed out.
Connection attempt to Gracenote server was successful.
Last successful iTunes Store access was 2012-01-18 20:10:05.
I've reset the firewall "outbound rules" as suggested in the help after the diagnostic test.  This only allows me to enter the store but upon initiating log out iTunes locks.  I've used the "netsh winsock reset" (as suggested here: https://discussions.apple.com/message/15905544#15905544) to no avail.
Any ideas are appreciated.

Answer 1

Thanks for the response.  Following the instructions in that article produces the following information.  Very close to what is described in the article but the names differ (IPv6 vs. IP) and a total of eight rather than 10 values.  I can't see any LSP interfering with this . . .
I've updated my Norton AntiVirus without effect.  Interestingly the firewall "inbound rules" shows one for iTunes even when the connectivity test fails.  If I delete the existing and create a new rule it will work only until I try to log out the current user.  Then the party is over.
Any other ideas?
Name
MSAFD Tcpip [TCP/IPv6]
Connectionless Service
No
Guarantees Delivery
Yes
Guarantees Sequencing
Yes
Maximum Address Size
28 bytes
Maximum Message Size
0 bytes
Message Oriented
No
Minimum Address Size
28 bytes
Pseudo Stream Oriented
No
Supports Broadcasting
No
Supports Connect Data
No
Supports Disconnect Data
No
Supports Encryption
No
Supports Expedited Data
Yes
Supports Graceful Closing
Yes
Supports Guaranteed Bandwidth
No
Supports Multicasting
No
Name
MSAFD Tcpip [UDP/IPv6]
Connectionless Service
Yes
Guarantees Delivery
No
Guarantees Sequencing
No
Maximum Address Size
28 bytes
Maximum Message Size
63.99 KB (65,527 bytes)
Message Oriented
Yes
Minimum Address Size
28 bytes
Pseudo Stream Oriented
No
Supports Broadcasting
Yes
Supports Connect Data
No
Supports Disconnect Data
No
Supports Encryption
No
Supports Expedited Data
No
Supports Graceful Closing
No
Supports Guaranteed Bandwidth
No
Supports Multicasting
Yes
Name
MSAFD Tcpip [TCP/IP]
Connectionless Service
No
Guarantees Delivery
Yes
Guarantees Sequencing
Yes
Maximum Address Size
16 bytes
Maximum Message Size
0 bytes
Message Oriented
No
Minimum Address Size
16 bytes
Pseudo Stream Oriented
No
Supports Broadcasting
No
Supports Connect Data
No
Supports Disconnect Data
No
Supports Encryption
No
Supports Expedited Data
Yes
Supports Graceful Closing
Yes
Supports Guaranteed Bandwidth
No
Supports Multicasting
No
Name
MSAFD Tcpip [UDP/IP]
Connectionless Service
Yes
Guarantees Delivery
No
Guarantees Sequencing
No
Maximum Address Size
16 bytes
Maximum Message Size
63.99 KB (65,527 bytes)
Message Oriented
Yes
Minimum Address Size
16 bytes
Pseudo Stream Oriented
No
Supports Broadcasting
Yes
Supports Connect Data
No
Supports Disconnect Data
No
Supports Encryption
No
Supports Expedited Data
No
Supports Graceful Closing
No
Supports Guaranteed Bandwidth
No
Supports Multicasting
Yes
Name
RSVP TCPv6 Service Provider
Connectionless Service
No
Guarantees Delivery
Yes
Guarantees Sequencing
Yes
Maximum Address Size
28 bytes
Maximum Message Size
0 bytes
Message Oriented
No
Minimum Address Size
28 bytes
Pseudo Stream Oriented
No
Supports Broadcasting
No
Supports Connect Data
No
Supports Disconnect Data
No
Supports Encryption
Yes
Supports Expedited Data
Yes
Supports Graceful Closing
Yes
Supports Guaranteed Bandwidth
No
Supports Multicasting
No
Name
RSVP TCP Service Provider
Connectionless Service
No
Guarantees Delivery
Yes
Guarantees Sequencing
Yes
Maximum Address Size
16 bytes
Maximum Message Size
0 bytes
Message Oriented
No
Minimum Address Size
16 bytes
Pseudo Stream Oriented
No
Supports Broadcasting
No
Supports Connect Data
No
Supports Disconnect Data
No
Supports Encryption
Yes
Supports Expedited Data
Yes
Supports Graceful Closing
Yes
Supports Guaranteed Bandwidth
No
Supports Multicasting
No
Name
RSVP UDPv6 Service Provider
Connectionless Service
Yes
Guarantees Delivery
No
Guarantees Sequencing
No
Maximum Address Size
28 bytes
Maximum Message Size
63.99 KB (65,527 bytes)
Message Oriented
Yes
Minimum Address Size
28 bytes
Pseudo Stream Oriented
No
Supports Broadcasting
Yes
Supports Connect Data
No
Supports Disconnect Data
No
Supports Encryption
Yes
Supports Expedited Data
No
Supports Graceful Closing
No
Supports Guaranteed Bandwidth
No
Supports Multicasting
Yes
Name
RSVP UDP Service Provider
Connectionless Service
Yes
Guarantees Delivery
No
Guarantees Sequencing
No
Maximum Address Size
16 bytes
Maximum Message Size
63.99 KB (65,527 bytes)
Message Oriented
Yes
Minimum Address Size
16 bytes
Pseudo Stream Oriented
No
Supports Broadcasting
Yes
Supports Connect Data
No
Supports Disconnect Data
No
Supports Encryption
Yes
Supports Expedited Data
No
Supports Graceful Closing
No
Supports Guaranteed Bandwidth
No
Supports Multicasting
Yes