Ipod Touch 4--Not recognized in iTunes

Question

As per the title, my Touch 4 is not showing up under "Devices".
I've tried uninstalling and reinstalling iTunes (going so far as to run a registry cleaner to ensure all traces are gone), and rebooting, to no avail. I have an ongoing problem with Bonjour and sharing media (under Sharing in Preferences, iTunes claims my Bonjour service is disabled, when it is indeed running automatically under "Services"), but it doesn't prevent my Nano from being recognized. The Touch also doesn't appear under "My Computer".
I have no doubt this is a local problem on my computer, but I've run out of ideas and patience. Apple's recommended 'solutions' don't work, and there are no further given steps should the problem continue.
Help would be very greatly appreciated so I can start using this Touch to its full potential!
Boom

Answer 1

The following is a diagnostic report run from iTunes. It's interesting, as iTunes is enabled in the windows firewall, yet refuses to recognize me as an administrator.
Microsoft Windows 7 x64 Home Premium Edition Service Pack 1 (Build 7601)
ASUSTeK Computer Inc. N61Jq
iTunes 10.6.0.40
QuickTime not available
FairPlay 1.14.34
Apple Application Support 2.1.7
iPod Updater Library 10.0d2
CD Driver 2.2.0.1
CD Driver DLL 2.1.1.1
Apple Mobile Device 5.1.1.4
Apple Mobile Device Driver 1.59.0.0
Bonjour 2.0.2.0
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 003CAB9C0F41E018
Current user is not an administrator.
The current local date and time is 2012-03-17 10:49:31.
iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is supported.
Core Media is supported.
Video Display Information
Advanced Micro Devices, Inc., AMD Radeon HD 6570M/5700 Series
**** External Plug-ins Information ****
Plug-in Name:         mmkeys.dll
Plug-in Loaded:      Yes
Plug-in Version:      Unknown
Plug-in File Version:              Unknown
Plug-in Path:           C:\Users\Milan\AppData\Roaming\Apple Computer\iTunes\iTunes Plug-ins\mmkeys.dll
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name:        {5D75EB69-A527-4AED-B6A8-3139B2AB4F1E}
Description:            Microsoft Virtual WiFi Miniport Adapter
IP Address:             0.0.0.0
Subnet Mask:          0.0.0.0
Default Gateway:    0.0.0.0
DHCP Enabled:      Yes
DHCP Server:        
Lease Obtained:     Wed Dec 31 19:00:00 1969
Lease Expires:       Wed Dec 31 19:00:00 1969
DNS Servers:        
Adapter Name:        {CD25755F-0D10-4EA0-9C72-A488B6BA4434}
Description:            Intel(R) Centrino(R) Advanced-N 6200 AGN
IP Address:             192.168.1.136
Subnet Mask:          255.255.255.0
Default Gateway:    192.168.1.1
DHCP Enabled:      Yes
DHCP Server:         192.168.1.1
Lease Obtained:     Sat Mar 17 09:41:08 2012
Lease Expires:       Sun Mar 18 09:41:08 2012
DNS Servers:         192.168.1.1
Adapter Name:        {1867589A-E290-4BB5-BCCD-A89F57BA7C93}
Description:            Bluetooth Personal Area Network
IP Address:             0.0.0.0
Subnet Mask:          0.0.0.0
Default Gateway:    0.0.0.0
DHCP Enabled:      Yes
DHCP Server:        
Lease Obtained:     Wed Dec 31 19:00:00 1969
Lease Expires:       Wed Dec 31 19:00:00 1969
DNS Servers:        
Adapter Name:        {DAFC4586-8644-495B-A4F9-41C555FB9994}
Description:            Atheros AR8131 PCI-E Gigabit Ethernet Controller (NDIS 6.20)
IP Address:             0.0.0.0
Subnet Mask:          0.0.0.0
Default Gateway:    0.0.0.0
DHCP Enabled:      Yes
DHCP Server:        
Lease Obtained:     Wed Dec 31 19:00:00 1969
Lease Expires:       Wed Dec 31 19:00:00 1969
DNS Servers:        
Active Connection: LAN Connection
Connected:             Yes
Online:                    Yes
Using Modem:        No
Using LAN:             Yes
Using Proxy:           No
Firewall Information
Windows Firewall is on.
iTunes is enabled in Windows Firewall.
Connection attempt to Apple web site was unsuccessful.
The network connection timed out.
Basic connection to the store failed.
The network connection timed out.
Connection attempt to Gracenote server was successful.
The network connection timed out.
Last successful iTunes Store access was 2012-02-27 20:13:16.
**** Device Connectivity Tests ****
iPodService 10.6.0.40 (x64) is currently running.
iTunesHelper 10.6.0.40 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
Universal Serial Bus Controllers:
Renesas Electronics USB 3.0 Host Controller.  Device is working properly.
Intel(R) 5 Series/3400 Series Chipset Family USB Enhanced Host Controller - 3B34.  Device is working properly.
Intel(R) 5 Series/3400 Series Chipset Family USB Enhanced Host Controller - 3B3C.  Device is working properly.
No FireWire (IEEE 1394) Host Controller found.
Most Recent Devices Not Currently Connected:
iPod nano (4th Generation) running firmware version 1.0.4
Serial Number:       6U846T8B3R0
**** Device Sync Tests ****
No iPod, iPhone, or iPad found.