Go to the following page.

http://support.microsoft.com/kb/244474/en-us

Also I installed

http://www.microsoft.com/downloads/details.aspx?FamilyID=1B286E6D-8912-4E18-B570-42470E2F3582&displaylang=en

With both of these install now the logon and logoff times for clients have been reduced by at least 1000%.  I also rebooted the server so I don't know if that contributed to it.  I will check on the server later on in the week to see the performance of the box.