I am having a registry issue also.

Different in that when I install SQL 2000 to new nodes added to the cluster,

The HKey_local_machine\software\microsoft\microsoft SQL Server\instancename\MSSQLSERVER

is not being set up completely and does not match the registries on the other nodes.

Missing keys, unc's instead of drive letter, default port instead of what we assigned, named pipes incorrect etc...

In this 4 node cluster there are 4 instances.

2 of the 4 instances installed great and work just fine across all 4 nodes.

The other 2 are giving trouble on the two new nodes.

After many reinstalls,my last attempt will be to export reg key from 2 working nodes and apply on new nodes and see if that resolves issue when I fail over. I am hopeful but right now might be 50/50.

I just hate that I have to do this reg hack.

I think it is somehow related to communication with the cluster resources.

not sure. Have posted in two spots and nobody has touched this isssue yet.