explorer view on sharepoint: no response or error message

I would say the post Scoutman put up is really helpful. solved the issues i've been having for months with the password prompt in all Office docs.
http://social.technet.microsoft.com/Forums/en-US/sharepointgeneral/thread/023f4b23-3ce6-4d83-8cb0-7398b88ba6ab/?prof=required
Remove WebDav from your Sharepoint Servers and reboot them. It will fix the issue with Windows Explorer view. Also, if you have your system x64 bit, make sure you open IE x86 to launch Explorer View.


 source: http://social.msdn.microsoft.com/Forums/en/sharepointecm/thread/dba159c7-517a-4389-98b6-fdf2f97b6b24

Open in Windows Explorer doesn’t work in SharePoint site

June 20, 2011

Environment: Windows Server 2008, IIS 7
Symptom:
In a document library when you try to open the “Open in Windows Explorer” under the actions menu either nothing happens or you receive an error.
If you try to change the view to “Explorer view” in the document library then you see a similar error in an iframe:

Internet Explorer cannot display the webpage

Cause:
Both IIS 7 and SharePoint has a separate implementation for the WebDAV module. If both modules are active at the same time then the SharePoint WebDAV won’t work.
Solution:
Disable the IIS WebDAV module for your SharePoint web application. Update the web.config file and add the following line under configuration/system.webServer/modules to remove the IIS WebDAVModule:

source: http://expectedexception.wordpress.com/2011/06/20/open-in-windows-explorer-doesnt-work-in-sharepoint-site/