I hope this helps. Someone showed me that our Document Library may not be working in Windows 7 because we are using Basic Authentication, and Windows 7 only supports Digest Authentication. He then pulled up an Apache somethin-or-nother, showed the Windows 7 failure with Basic authentication, and then changed to Digest authentication and showed me it working. I think he said that this was how Sharepoint 2010 was now working.
Again, I hope this helps,