Sounds like you've tried most everything...I dunno. Have you installed 64-bit 12.3.2.35?
Yes
Does it log-in OK to your Apple Store account?
Is that make a difference ? Actually I logged in successfully to Apple Store with a new account, BUT the iphone I connected is under a different Apple Store's account name. Is iTunes supposed to not show an iPhone under a different Apple' account than the one iTunes is logged to ?
If yes that would be strange because I could choose to not log into an account when iTunes start running and ask the question and my understanding is that iTunes must show whatever device is connected to! (I may be wrong)
BTW I see something strange: each time I launch iTunes, it asks me to log into the new account I created (a popup window). With my old account, once I logged into it successfully, did whatever I want and then closed iTunes, when I reopened iTunes, it didn't ask me again to log in (it logged automatically to that account).
With the new account I created, iTunes doesn't seem to remember my last successful login in order to log in automatically !
When you go to Prefs then Devices do your iGizmo backups show-up there?
under preferences, Device, Backups, Restore, etc. are all greyed out (can't click)
How long have you waited after plug-in to see if it recognized? Do you have an iPad or a friend's phone to try? Do you get a "Trust this computer?" display on your phone?
I waited long enough (few minutes!). I tried 2 iPhone 5 and one iPhone 4. None is recognized in iTunes.
I get the message "Trust this computer?" in iphone once I connect it. I answer YES of course each time. That's why I can see the iPhone in Windows Explorer and can transfer photos to/from it (and that's why this is unusual: Windows sees it but not the iTunes!). If I answer NO to trust the computer question, Windows Explorer still can see the iPhone but I can't see what is in it which is normal.
Are you familiar with Windows Device Manager and have you done a "Show hidden devices to make sure there aren't a bunch of greyed-out iphones in there (and then uninstalled each)? Under Portable Devices.
I have no more any greyed-out device or any with a "!" mark with it in the device manager.
Actually as I said, before reinstalling the drivers, iPhone would show in device manager as some USB device under USB (not in Portable Devices) with a yellow "!" mark. I then removed the driver and asked Windows to search my computer to reinstall it which it did successfully. Now iPhone appears without any warning under Portable Devices in Windows device manager
I wonder a bit about how your last version could possibly have been 11. It seems as if 12 has been around for some 16-18 months.
Sorry, it wasn't 11. It was 12.1 or 12.2 and now the iTunes version that doesn't recognize iPhones is 12.3...
I did try to reinstall iTunes BUT without rebooting between uninstall and reinstall. Also I didn't manually remove iTunes components that may have stayed in my computer after iTunes was uninstalled.
I could try that and also maybe there is something to do with Apple store's account (that is the account under which iPhone is running must be the same as the account I log in, in iTunes)