Vista 64 and WebDAV

I am trying to get Vista 64 SP1 to connect to a Webdav share using https it
works on Vista 32 and XP without any problem.

I have tried installing the Web Folder patch at
http://www.microsoft.com/downloads/t...displayLang=en a couple times
I have tried changing the Network Security LAN Manager authentication level
to "Send LM & NTLM - use NTLMv2 session Security if negotiated" in the local
security policy no good I still get the following "The folder you entered
does not appear to be valid. Please choose another. " Any help would great
this has been driving me crazy thanks