Oracle registry entries lost.

Relative novice DBA here....
We were having a problem with a drive controller on one of our development database servers and the system admin had to re-install the operating system (Windows2000) and that efficiently wiped out all the Oracle registry entries. The database files are all still out there and Oracle is still installed, but of course since the registry entries aren't there it won't start up.
Is there any way to recreate those entries, or can I re-install Oracle, create databases and point them to the existing files. Will it be able to recognize that the files have data and be able to read them?
There were no backups because it was a development box and the data could just be reloaded (a long process I'm trying to avoid).
I can re-install Oracle entirely, recreate the databases from the DDL and reload the data, but I'm just trying to make sure there is not an easier way.
Is it "start from scratch" time?
I think this would be a good thing for folks to know.
Any help anyone can provide would be greatly appreciated. Thanks.
- Dave Matern

If you only re-installed the Oracle software and didn't touch any of the database files, it should have worked. I just did the same a few days ago on my laptop when Oracle installer (again) messed up when trying to de-install an obsolete oracle_home.
Maybe because you had a problem with the controller, the control file and data files went out of synch in some way. Now, I am not a DBA, so this is getting a bit tricky for me too. You may try to recreate the control file. Backup everything before you do this!
SVRMGR
CONNECT INTERNAL
STARTUP MOUNT PFILE=<fullpath>
ALTER DATABASE BACKUP CONTROLFILE TO TRACE RESETLOGS; This will create a trace file in the trace file directory. The file will have the extension ".trc" and is located either in the directory defined by the initialization parameter 'user_dump_dest', or, if this is not defined in "ORACLE_HOME/rdbms/log," the file should be copied to a name such as "ccf<SID>.sql.
Check this script to see if all the paths and files are correct. Then:
SVRMGR
CONNECT INTERNAL
STARTUP NOMOUNT PFILE=<fullpath>
@ccf<SID>.sql
ALTER DATABASE OPEN RESETLOGS;

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address = "my address",
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