It says to click the device button in the upper right corner....there isn't one. Itunes doesn't even recognize my devices since I did the most current update. I have two iPhones, thru different carriers, and neither one works now!

I did the latest iTunes update...I have 2 iPhones--each thru a different provider. Now, I can't sync to download any music from iTunes. iTunes doesn't recognize either device now. I went thru diagnostics, didn't work. I tried the suggestions from Apple...it says to click the device button in upper right corner....there isn't one. When I connected each for the first time after update, it "installed device drivers". I have checked for further updates on iTunes--nothing. I made sure there were no updates listed for iPhones...all up to date. I get an error code and from what I have looked through in forums etc, it seems like a lot of people are getting it...0ex000084 I believe it was. Windows opens to download photos but that's it. Devices are not listed at all. I have tried all 3 USB ports in computer too. I have never had any problems before this update!! HELP! I just bought $15 worth of music I can't download to phones now!