Sharepoint prompting credentials for Explorer mapped drives

I have lived with the sharepoint explorer link prompting for many years, but found the solution below.  Oh joy.....

Windows 7 | The SharePoint Project: "1.   Click Start, type REGEDIT in the Start Search box, and then press ENTER.

2.   Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters"

make sire the sites you add start with http://  ie http://your sharepoint site.
Other blogs say you have to put the entries in twice.

Then goto services and restart the web client service.

Hey presto - it works.... (or at least should... and did for me)