Itunes not detecting, seeing, recognizing iphone on ios 7

Question

Putting this question up in iPhone forum, seeing as over 100 people saw my post in itunes section and, I'm assuming, can't help.
Running 7.0.4 on iPhone 4S, Windows 7 64-bit with iTunes 64-bit version of 11.1.3.
iPhone was previously detected by iTunes prior to update.
A second iPhone 4S running iOS 6 is consistently detected without any problems.
I have already tried all solutions given on this support page (http://support.apple.com/kb/TS1538) to no avail.
In device manager, no x or ! shows up.
iTunes already on latest version.
Tried multiple USB cables, all genuine. Tried multiple USB ports, all working but iPhone still doesn't show up.
Apple Mobile Device Support is definitely installed. Tried reinstalling AMDS and iTunes. Tried restarting AMDS. No good.
Tried installing driver from Common Files directory.
No software changes between iOS 6 and iOS 7 update. No possibility of third party software conflict.
Note: was able to restore the iPhone to 7.0.4 from 7.0.2 on my MacBook Pro so there's nothing wrong with the phone or cable. This is not a viable long term option for me, since the MBP is a work computer.
Please help if you know of any solutions.
Additional notes:
- already tried http://support.apple.com/kb/TS1363?viewlocale=en_US and it was no good.
Did a diagnostics test on iTunes. This first screenshot is BEFORE I plug in the iPhone.
After plugging in the iPhone and trusting the computer (this trust popup, by the way, continuously comes up EVERY TIME I plug the iPhone into the computer. Stopped popping up after the first time I plugged into Mac but it comes up EVERYTIME on Windows), I get the User Account Control popup asking for permission. I click Yes. See the difference in following screenshot:
Please help!

Answer 1

Hi oxman78,
That definitely sounds frustrating! Let's give this a go to see if we can isolate the issue futher:
First, connect your device and choose the "Music" tab. Next, uncheck the "Sync Music" checkbox, and apply the changes (so there is ultimately no music syncing to your iPhone).
Once you have done that, recheck the "Sync Music" checkbox, and apply the changes once more. This will instruct iTunes to completely remove all music from your iPhone, and then copy the files once more. If you have a large amount of music, this initial sync may take a while.
iOS: Syncing your data with iTunes
http://support.apple.com/kb/HT1386
iTunes 11 for Mac: Set up syncing for iPod, iPhone, or iPad
http://support.apple.com/kb/PH12113
Cheers!,
Matt M.