Can't log into iTunes account (error 0x80090326)

Please Help!

I logged off iTunes on my PC and now can't sign back into my account. I receive the following error "We could not complete your iTunes request. An unknown error occured (error 0x80090326). Because of this, I cannot backup, update or sync anything. For what it's worth my log in on iPhone works fine. I spoke to level 2 at Apple Care for hours and nothing works. I'm at a loss. Any solution would be appreciated

Windows XP

I have tried the following:

installing and reinstalling iTunes

flushing DNS

winsock review and repair

repair of QuickTime and iTunes

ensured iTunes was selected as exception for Windows Firewall

Windows XP patch from 2009 (suggested in previous post)

Also uninstalled anti-virus, turned off firewall. Nothing works