Logging in takes 20 minutes on SBS

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I have a windows 2003 SBS network with 40 users. A few days ago
something happened (not sure what), logging in now takes between 15-20
minutes from the time a user puts their password till the time the
desktop shows up. This problem doesn't happen with "Domain Admins"
accounts and it seems it does not happen on any machine that a user
has never logged on to before. I mean the problem can happen on my
computer if I logon with my account, but if someone who has never
logged on to my machine tries to logon, the desktop comes rightaway.

I ran dcdiag on the server and i found a "[Fatal]" error on the domain
controllers (2 in total) so I ran dcdiag /fix and that error is
resolved. I restarted the network, i restarted the switches, I even
disabled all group policies with no luck.

Any ideas?
Thanks
.

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