Slow login windows 7 helppppp

We have a considerable number os windows 7 workstations and a domain in Windows 2003, the question is that the first login that these workstations do to the windows 2003 domain takes about 5 minutes to complete, i press CTRL+ALT+DEL, then wrote my credentials and it goes to the welcome screen and stays there for about 10 minutes... After that it shows the desktop.


What can i do to fast the login process?


Thanks in advanced
Best regards

Acer