I've been having been trying to fix this problem for a long time and are out of ideas so hoping someone can help.

We have a Windows 2003 R2 server running active directory for our windows 7 PCs. over the last few days i have notiiced that login are taking a long time (10 minutes+ for all profiles (even profiles that are not setup to roam).

After checking the DNS server there are no Forward or Reverse zones setup so the DC records are not in there.

I have tried evreything i can think of to try and get them back.

I have tried removing and readding the DNS. 

When i try and run the Configure a DNS server i get to the end and get the following error.

"DNS Configure wizard error. The forward lookup zone cannot be added to the server. The specified directory partition does not exist"

Anyone got any idea as i can't seem to find any answers to this.

Thanks