Check out this link ... it explains clearly how to do so in Itunes (Edit/Preferences/Devices) then delete them.
However, I had no backups listed, so down further on the page, there is an explanation of how to delete within Windows 7 ...
"I fixed it by opening the backup folder (:\Users\\AppData\Roaming\Apple Computer\MobileSync\Backup). The backup folder contained one folder, which I deleted. Then I went back to iTunes, right clicked my iPhone and chose Back Up. now everything works fine!
I’m using Windows 7, so the path to the backup folder may be different in your case."
I applied this fix and it totally worked for me ... no more corrupt backup file.
Also, I did shut down my firewall (Zone Alarm) just in case. I am running Windows 7 professional.
The iPod backup file(s) are here:
iTunes places the backup files in the following places:
- Mac: ~/Library/Application Support/MobileSync/Backup/
- Windows XP: \Documents and Settings\(username)\Application Data\Apple Computer\MobileSync\Backup\
- Windows Vista and Windows 7: \Users\(username)\AppData\Roaming\Apple Computer\MobileSync\Backup\
Note: If you do not see the AppData or Application Data folders, you may need to show hidden files (Windows XP, Windows Vista and Windows 7), or iTunes may not be installed in the default location. Show hidden files and then search the hard drive for the Backup directory.