XP to Vista (new machine) event 6005 taking long time

Hello,

I have used XP for long time on our Windows 2003SBS network, and boot times
were about 25-30 seconds. I just put a new machine on the network (VISTA
BUSINESS) and it is taking almost 3 minutes to boot and come to a signon
screen.

Windows Event Viewer shows:

The winlogon notification subscriber <GPClient> is taking long time to
handle the notification event (CreateSession).

The time between the previous entry and this entry is 34 seconds. The times
between the 6005 and 6006 entry is 58 seconds.

The winlogon notification subscriber <GPClient> took 113 second(s) to
handle the notification event (CreateSession).

Help! (those MAC commericals are looking better and better all the time)

Thank you.