Thanx a lot.

I downloaded and i could not connect with DB.

The following error shows.

Error while trying to retrieve text for error ORA-12154

Details:
Building Oracle HOMES List
HOME Name OraHome81 added to list.
HOME Name oem added to list.
Found multiple homes, searching each HOMEx for valid PATH
searching in SOFTWARE\ORACLE\HOME1
Oracle_Home found in SOFTWARE\ORACLE\HOME1 IS in system path!
searching in SOFTWARE\ORACLE\HOME0
Using: C:\oem\bin\ORA804.DLL

What could be the problem.