When you try to set up a web folder by “adding a network location” or “map a network drive” through My Computer, you can get an error message saying that either “The folder you entered does not appear to be valid. Please choose another” or “Windows cannot access… Check the spelling of the name. Otherwise, there might be…”. These errors may appear when you are using SSL or non-SSL.
To fix this, do as follows:
Go to Windows Registry Editor.
Find a key: \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlset\services\WebClient\Parameters\BasicAuthLevel .
Change the value to 2.