Wi-Fi Sync not working on upgraded iPhone 4

Hello! I'm currently encountering a problem with Wi-Fi Sync for my iPhone 4 loaded with iOS 5. Here goes!!!
On my iTunes's left pane, a caution sign (exclaimation mark with triangle) appears beside the eject icon. I can sync via cable but not Wi-Fi.
Things I've tried:
Disabling AVG Firewall (AVG Internet Security 2011)
Plugging/unplugging USB cable of iPhone
Reboot Router/Modem
Unsecure/Re-secure Wi-Fi network
Restart iTunes/PC
Re-added "Apple push", "iTuneshelper","Quicktime" startup autorun after disabling it in msconfig
Reinstall iTunes
Virus scan (-.-)
Charging till 100% battery
That's the "Summary" page of my iPhone on iTunes
Has anyone devised a fix to this issue? (-50)error
Thanks in advance!

Now I've got a new problem. I've noticed that once I got this Wi-Fi sync working, I turned on my AVG firewall (enabled) All of a sudden iTunes says "Looking for iPhone" with the swirling green bar. Tried twice and it really stopped the sync. I'm speculating it's my AVG firewall acting up apart from the running netsh in command prompt which fixed my problem.
This was what I had to do in command prompt for Windows users. I recommend that you run this fix only if you're experiencing the same issue though in the KB article at Microsoft it says its nothing malicious.
Use a manual method to reset TCP/IP
Note This section is intended for advanced computer users. If you are not comfortable with advanced troubleshooting, ask someone for help or contact Support. For information about how to contact Support, see the Microsoft Help and Support contact information Web site:
http://support.microsoft.com/contactus
The reset command is available in the IP context of the NetShell utility. Follow these steps to use the reset command to reset TCP/IP manually:
To open a command prompt, click Start and then click Run. Copy and paste (or type) the following command in the Open box and then press ENTER:cmd
At the command prompt, copy and paste (or type) the following command and then press ENTER:netsh int ip reset c:\resetlog.txtNote If you do not want to specify a directory path for the log file, use the following command:netsh int ip reset resetlog.txt
Reboot the computer.

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Wi-Fi Sync not working on upgraded iPhone 4

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