Wi-Fi configurations are complicated and losing them when you reinstall Windows can be a pain. Wi-Fi Network Backup Manager saves you from this by letting you backup all of your Wi-Fi settings including network names, passwords and keys into an XML file, which you can save at a safe place.
Simply run the application file and choose the Wi-Fi profiles you wish to save. When you’re finished reinstalling Windows, reinstall Wi-Fi Network Backup Manager and import the XML file to restore all of the old networks and their passwords.
Wi-Fi Network Backup Manager is completely free.