How to make a backup of Apple devices on a new windows PC (as it keeps giving a backup corrupt error)

I have about 5 Apple devices that I need to back up to a newly purchased Windows 10 PC. They were previously backed up to my prior computer but now I don't know how to make new backups on the new PC. I've installed iTunes, authorized the new PC, and attempted to make a backup of my iphone. It gave me a message that the back up is corrupted and directed me to delete it. Of course, when looking in preferences > devices, there are no backups as it's a new computer. What's the trick for being able to make backups on a new PC as it seems to be looking for old backups?