Dec 022011
If you are trying to connect to a Sharepoint document library via UNC path and receive the following error
No network provider accepted the give network path
You are probably trying to connect via Windows 2003
You need to change the Startup Type and start the WebClient Service on the server.
Also, you will need to follow the these instructions from Microsoft Technet.
http://support.microsoft.com/?kbid=841215