We are currently running server 2000 which has active directory,dns & dhcp running, we are planning to deploy a new server on 2008 platform. Can i be able to migrate those roles to the new server if not any ideas on the most effective way to go about it.

Thanks man i had not done my research well the old server happened to be windows nt not 2k anyway i have resolved to create a new active directory since i have around 30 machines and similar number of users it should not be that hard thanks anyway

Yeah Windows NT4 is virtually impossible to transition from, as the "Old-style" NT domains are not the same as an Active Directory domain e.g. they use WINS instead of DNS...

I think there is an AD migration tool somewhere on the MS site for it though (sp6 resource kit?)