Question : Windows 7 slow logon sbs 2003

Hi,

I have a problem with some of the workstations connected to a sbs 2003 domain.everything was working fine but suddenly the windows 7 machines take a long time to login.Other workstations which are windows xp donot take time to logon.It takes about 5 minutes after entering the password on the welcome screen.There are no other dc's in the domain and the dhcp was recently changed to the router.Dns seems to be working fine.Also how to enable user env login in windows 7?
All suggestions are welcome
Thanks!!

Answer : Windows 7 slow logon sbs 2003

This kind of shortcoming is existent in SharePoint. Take a look at SharePoint AD Sync, which solves this as SUNILREPALE suggested above.