rebuilding a node on a cluster

Hi,

We have 2 clusters, 1 running SQL 2008 on Windows 2008 R2 server and 1 running SQL 2000 on Windows 2003 Server.

Because of a disaster with the disks, each of the passive nodes had to be rebuilt and Ive been asked to install SQL on the nodes.

Ive not done this before. Does this mean simply adding a new node to the cluster through the wizard? Or do I need to reinstall the entire cluster?

I think SQL 2000 is too risky as its unsupported, so Im going to resist that. But how should I approach the SQL 2008 Instance?

Thanks,

Zoe