I recieve the following error when try to connect to a database from my machine:-

Error while trying to retreive text for error ORA-03121
Then if you go into detail:-
Building Oracle HOMES List
HOME Name DEFAULT_HOME added to list.
Found multiple homes, searching each HOMEx for valid PATH
Oracle_Home found in SOFTWARE\ORACLE\HOME0 IS in system path!
Using: C:\WINNT\system32\orant71.dll

This only happens with certain application connecting to the database some applications are perfectly ok