Unable to backup, iphone 4, 4.3.5, itunes 10.4, Windows 7

I've sync'd and backed up many times before, and now I get an error. I recently updated iTunes, but I can't say that is the cause.
The error is: iTunes could not back up the iPhone "Larry's iPhone" because the backup could not be saved on the computer.
I've researched the web and tried the usual: deleting old backups (in itunes, and manually, etc).
When I delete all the backups and logs, and then try to sync, iTunes hangs up. I have to kill iTunes in the Task Manager.
The only log that is created during this procedure lists this error:
7592 @ Tue Aug 16 00:45:43 2011] [com.apple.console AppleMobileBackup.exe] Unable to move temporary file "C:\Users\larry\AppData\Roaming\Apple Computer\MobileSync\Backup\Logs\MobileBackup-unknown-20110816-004543-Backup-Com puter.log" (3)
[7592 @ Tue Aug 16 00:45:43 2011] [com.apple.console AppleMobileBackup.exe] Unable to move temporary file "C:\Users\larry\AppData\Roaming\Apple Computer\MobileSync\Backup\Logs\MobileBackup-6c8e05c74e41b39c97494e9f2df753af74 fd6904-20110816-004543-Backup-Computer.log" (3)
[7592 @ Tue Aug 16 00:45:43 2011] [com.apple.console AppleMobileBackup.exe] WARNING: Backing up 6c8e05c74e41b39c97494e9f2df753af74fd6904
[7832 @ Tue Aug 16 00:47:43 2011] [_ISDVLog SyncServer.exe] Cancelling all sync plans.
[7832 @ Tue Aug 16 00:47:43 2011] [_ISDVLog SyncServer.exe] Goodnight, Gracie.
Anyone have any ideas? The file indicated doesn't even appear to exist, which might be why it's having trouble moving the file! Seems like sloppy programming since iTunes just hangs and won't quit.
I also ran the itunes installer and chose "repair" just for kicks. It didn't change anything.
(Please don't suggest that I disable security software. I uninstalled mine completely and it had no effect. )
Thanks,
Larry

Yes. In addition to deleting all the failed backup files, etc, I had to do one more step which I learned about from another thread.
The key for me on my windows 7 machine was to open a command shell (type "cmd" under search) and at the c prompt type 'netsh winsock reset' (do not include the apostrophe's of course). I may have rebooted afterwards. Try searching for that command along with "itunes backup."
I do not profess to understand what this command fixed. Obviously some condition in Windows 7 was hanging iTunes up during backup, and it was obviously something that Apple did not forsee. Running this command cleared the problem and allowed itunes to proceeed normally with my backup and I have not had an issue since.
I am keeping my finger's crossed.

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Unable to backup, iphone 4, 4.3.5, itunes 10.4, Windows 7

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