Are the Windows7 users  on x64? If so, are they using the 64 bit version of
Office? Anyone using a 64 bit version of Office on a 64 bit OS will have
issues with the Windows explorer  view of SharePoint because it is dependent
on an ActiveX control loaded by Office. The particular control is only
loaded when you install a 32bit version of Office. That's the most common
issue I see where explorer view  doesn't work in Windows 7.

I assume that MS will be issuing some sort of fix for this one?

I doubt it. Microsoft recommends installing 32bit Office by default, except for
a handful of reasons.

Here is the technet article:
technet.microsoft.com/en-us/library/cc261754%28office.12%29.aspx

This link goes to a TechNet article regarding file types and iFilters...
where is the reference to 32bit Office?

Browser support:
technet.microsoft.com/en-us/library/cc263526.aspx

Office 2010:
technet.microsoft.com/en-us/library/ee681792.aspx
http://msdn.microsoft.com/en-us/library/ee691831%28office.14%29.aspx

We're using SharePoint 2007.........................

I don't know if they will or not. So far the comments have just been that
people should use the 32 bit version of Office even on a 64 bit OS.

I was going to try this but it turns out we're not running 64-bit
Office.

Does selecting  Explorer View carry out the same action as open  with Windows
Explorer? I find it strange how neither work.

As a workaround I tried mapping the drives (which seemed to work) but when I go
to open (use) this newly created network  location nothing happens. I've since
restored a full backup of SharePoint and SQL to an old server we had and I was
able to map and use the locations as expected. Using this server is not a viable
option but it does suggest that something is configured differently on our
current server...

Could this be related?

" You cannot connect to a document  library in Windows SharePoint Services
3.0 or Windows SharePoint Services 2.0 by using Windows shell commands or by
using Explorer View"

<http://support.microsoft.com/kb/841215>

This is a problem  related to Basic Authentication. The client defaults are
different under Vista and Win 7 than under XP.

We have this same problem  after switching our users  to Vista. Explorer View
doesn't work, multiple upload to picture libraries  doesn't work, some users
can't save  a document  back to sharepoint  after they have opened the document up
from sharepoint (they only have the option to save it to their computer).

Our current work around is to create custom network  locations to the top of the
site collection that the user still has access  rights to.

I tried all the regedits but unfortunately none of them had any
effect.

Try the following, it is an authentication problem



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

3. On the Edit menu, point to New, and then click Multi-String Value.

4. Type AuthForwardServerList, and then press ENTER.

5. On the Edit menu, click Modify.

6. In the Value data box, type the URL of the server that hosts the Web
share, and then click OK.

Note You can also type a list of URLs in the Value data box. For more
information, see the

"Sample URL list" section in this article.

https://site.com or https://*.site.com

7. Exit Registry Editor.

8. restart webclient service

This was already in place in the registry. I did however
recreate it but it didn't resolve  the issue.