Suhas,
Check on the database host if /oracle/<SID>/112_64 exist.
sometimes in (7.31) the installer looks for /oracle/<SID>/11203
Try creating a link /oracle/<SID>/11203 -> /oracle/<SID>/112_64 or otherway (not remember from top of my head) /oracle/<SID>/112_64 -> /oracle/<SID>/11203
and continue the installer. Hope that should work (sometime we overlook obvious things)
Regards
Basit Shaikh