ITunes seems to be stuck "backing up" my phone while i try to update from 4.3.3 to 4.3.5.

The progress bar has the same very small amount shown as it did 45 minutes ago.  Any suggestions?
iPhone 4.  Windows 7.  iTunes 10 ver. 10.5.0.142

When you deleted all things Apple there is a specific procedure that assures you did not miss anything. That process is described here: http://support.apple.com/kb/HT1925
Also, if the problem occurs during backup and the winsock reset did not fix it you probably have a corrupt or only partially deleted backup. You may have to delete it manually:
Windows XP backs up the iPhone files to here:
C:\Documents and Settings\user\Application Data\Apple Computer\MobileSync\Backup
Windows Vista and Windows 7 backs up the iPhone files to here:
C:\Users\user\AppData\Roaming\Apple Computer\MobileSync\Backup
In both user is your logged in Windows user name. Delete EVERYTHING in the backup folder.

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