XP Pro Problemss with WEBDAV Folders

[Guest]

I have WebDAV folders running on SBS2003. Some of my XP Pro SP2 machines can
access the folders without incident. Others report: "The workstation driver
is not installed" when I try to access the folder.

Some issues already addressed - where comparative references are made, they
refer to comparisons between machines that can access and machines that
cannot.

All machines are fully patched with automatic updates.
from what I can tell, WEBClient .dll files are same between machines, but I
may not have fully investigated that.
HKLM\CCS\Services\WebClient key and values are identical
Machines using same VPN tunnel to access server
Behavior consistent when no VPN tunnel is utilized
Network config looks the same between machines
There are both IE6 and IE7 machines that do and do not work

I suspect Firefox - it is or was installed on the two problem machines. But
note the operative word WAS - on one machine - obviously uninstalling won't
do any good since it's already gone.

How can I reinstall and/or reconfigure WebClient so that it functions
correctly?

Help will be GREATLY appreciated!!!

Thanks.

 

[Guest]

Hey folks, I still need help with this! Anyone game???

I tried reinstalling XPSP2 - that HELPED on one machine - I can actually
access a folder via WebDav, but on this machine not all the files in the
folder display - only ONE displays.

Again - anyone know of a way I can re-install or re-configure WebClient
components? Should I uninstall and re-install TCP/IP??? (yuck).

Thanks.