How to recover from formatted disk

Hi
I have a problem searched google and feeling very hopeless. Actually i have installed Oracle 8.1.0 on D drive and my Operating System on C drive crashes. I have all files of installed Oracle but now don't know how to recover my DB.
I have installed OS and Oracle on C drive now but what to do next. PLZ consider me a developer rather DBA.
Regards
Bilal

Here are steps to recover in this type of failures:
1). install O.S
2). Install Oracle (software only)
3). Create Service (in windows case only) using oradim utility
4). Recover/repair/start database
--- since you have reinstalled the software and the Oracle_home might have changed, (as said earlier) so in new Oracle home\database folder, copy your pfile/spfile and password file.
--- make sure all relevant folders are created for dump directories as it is mentioned in pfile/spfile.
--- startup the database

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