Disaster Recovery on Windows

We are trying to do a restore from one Windows server to a new server.  If the 
registry cannot be restored so that it matches the registry on the old server, 
is it possible to (a) manually remove Oracle by removing the Oracle directory 
and (b) then reinstall the software and still use the RMAN backups that were 
created on the first server?
 
Are there any other "gotchas" that can come up by trying to do it this way?
 
 
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