Can't connect to itunes store, sync, recognize iphone

Question

I-tunes was working fine until a month ago when i-tunes would not open when I plugged my iphone 4 into Dell XPS Windows 7 computer.
When I open i-tunes manually, I could not connect to itunes store, diagnostics would not work, i-tunes would not sync with my iphone. The error message I would always see was "itunes could not connect to itunes store. Make sure your network connection is active and try again." Of interest, whenever I open itunes, I would be asked to under the user account control "start or stop mobile device service on this computer" which I never saw before.
So far, I have set time/date, configured internet options(SSL 3.0 and TLS 1.0), disabled Norton Security with Backup without benefit. I deleted i-tunes from the computer and re-installed it with the same results after trying to restore from a point last year also without help. I was able to install itunes in an old computer I used to use with Norton Security with Backup (Dell Inspiron 1525 with Windows Vista) and it worked fine with the same network connection. However, I can't rely on that computer since the battery won't recharge and it is 10 years old.
Any suggestions? Thank you!

Answer 1

I've suddenly begun to experience issues with my authorization each time I try to sync my ipod.  I keep re-entering my log in information and it will either tell me that the pc is already authorized or say that it cannot connect to the itunes store.  I never had issues prior to installing the x64 client that ruined everything for me.  Even after changing to the 32 bit client my problems also persist and apple needs to correct the issues plaguing the itunes software.
You might try uninstalling all apple software and then delete the itunes files in the installation folder and in the program files (x86) folder then reboot and reinstall itunes.  I might try this myself and see what happens or just go back to the x64 client and lose my scrobbling ability which is why I went back to the 32 bit client in the first place.