Restoring Windows 2008 Server (Domain Controller)

We are using Backup Exec System Recovery 2010 to Image our DC.

Now this software has a feature to convert the backup into a vmware or hyper-v VM

I have also used disk2vhd to convert one of our dc's to a vhd and when I connected it into Hyper-V, it booted fine, I can login - BUT :-)

As soon as I login, I get the activation error, that change product key, this product key isn't good for this machine etc.

Question is : When in a real recovery situation, what would be the procedure to restore it either virtual or onto a physical box but be able to login and change product key etc ?

In this scenario its just locked down and I cant' do anything, if this is the case, how would I replicate my production environment via these tools ?

Any Ideas ?

Will be grateful for some real world examples here.

Same thing happens with our exchange backup / test restore either physical or virtual, can login but nothing else. Now we don't have the keys as they are OEM keys and just wondering what will happen in a real scenario, would we be purchasing another KEY or using the OEM key on our new server ?

This is a test environment I am trying to create by restoring our backups either into hyper-v or physical test machines.

Also, If I build up a machine (Server 2008) in a VM (Hyper-V), How can I restore just the system state backup of my DC into it ? will that give me the activation error too ? even though I would use the TRIAL ISOs provided by Microsoft ?

Kind regards