Please help - can't restore on Windows

We had everything restored to a new server.  The backups I am trying to restore 
from are from an RMAN full hotbackup.  This is 9207 on Windows 2003.  When I 
try to login to RMAN doing rman target system/passwd@dbname I get:
 
ORA-27100 shared memory realm already exists
 
However, I can't shutdown the database either because then I get 27101 shared 
memory realm does not exist.
 
I noticed that when they turned the server over to me that the services had 
already been started.  
 
How can I get out of this mess?
 
 
 
 
 
 
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