Iphone to itunes sync fail during step 3

HI I uprgraded my Iphone to the new ios 8 and now I cant sync it anymore.
The fail occurs during step 3 when it is transferring purchased apps.
The error text reads "The Iphone could not be synced because this computer is no longer authorized for purchased items that are on this iphone"
It then says "To authorize the computer for items purchased from the Itunes store, choose store > authorize this computer".
I have tried this multiple times, even unathorized it to authorize it again.
This Iphone still has some items under the previous owners apple ID, I dont know which ones have crossed over until it comes to app update time when it tells me.
I have been systematically deleting them one by one as they appear then downloading the app again from the app store under my apple ID.
Is this the correct thing to do or is this possibly why my sync is failing?

Hello, toshrobbo.
I've found an article that may help you sort things out with iTunes:
iTunes for Windows Vista or Windows 7: Troubleshooting unexpected quits, freezes, or launch issues
http://support.apple.com/kb/TS1717
Symptoms
This article provides some general suggestions when trying to troubleshoot an issue where iTunes for Windows Vista or Windows 7 won't open, stops responding, or unexpectedly quits. It may be useful to print this document before following the steps outlined below.
Cheers,
Allen

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Iphone to itunes sync fail during step 3

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