Windows Xp SP2 and WebDAV

Hi all,

I have a Windows Xp logged into a Active Directory domain.
I need to access to another AD domain (in another forest)
to update webpages using webdav protocol.

Since I installed WinXp SP2 this possibility is gone. I
cannot ask for the foreign domain administrator to change
anything, I have to count only with the configurations in
my Windows Xp machine.

Does anyone know how to solve this? Anything less activate
basic authentication...

Thanks.
Pedro