Setup of W2K Advance without the S P

I need to install advance server without the included service pack.

I just ordered a copy of advance server it comes with service pack 3.

We are testing new software and it has not been tested with service pack 3. So I need to install advance server without the service pack or an earlier service pack.

How can I do this with the only CD I have?

I don’t see an unistall option in Add/Remove Programs for service pack 3.

Thanks.
TM