I recently had on Oracle 11g Express database crash.

I have copied the .dbf files from C:\oraclexe\app\oracle\oradata\XE to another folder and reinstalled Oracle 11g Express.

The files are:

Control.dbf
sysaux.dbf
system.dbf
TEMP.DBF
UNDOTBS1.DBF

USERS.DBF
I want to remount the old database files, so that I can recover the database.

Can you please tell me how can I do this?