I had the same problem, things worked fine with IE7 and all of a
sudden, immediately after upgrading to IE8, I received the error
message, “Explorer View requires Internet Explorer 5.0 or greater and
Web Folders.”
Try “accessing the document library through Network Places” (kudos to
Ron Michael).
I had searched the Internet off and on for several weeks. I had tried
everything and was about to roll IE8 back down to IE7. Now I can
create folders and rename/copy/delete files. I can easily transfer
files between my computer and the server. I can also directly
manipulate large numbers of files on the server without moving
everything to my computer first. Hopefully this will work for you, too
(I am using the WIN XP PRO O/S).
If you are still not able to punch through, maybe one of the
workarounds (below, Problems using SharePoint Explorer View with IE8)
may fix your problem:
http://knowledge.byzet.com/2009/06/p...orer-view.html