WebDav isn't supported anymore on Windows since Windows 7.
I've tried BitKinex that is working fine but I didn't find any option to map a network drive to my WebDav share.
I'm now using DirectNet Drive. You can map a network drive to a server using the major network protocols (ftp, sftp, WebDav).
There is some drawbacks inherent to the fact that you are using files over the network, but this is running quite smoothly...