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Windows host? Which version, xp? Which "2nd client" version, instant client?
Double check the environment variables and %PATH%. Try changing directory to the particular client .../bin directory and run sqlplus from there, the client program you want may not be the client program you're getting.
%ORACLE_HOME% also needs to be pre-pended to %PATH%, with that second client it might be helpful to set up a .bat file with proper settings. Saves having to retype stuff which will also be typo-prone, i.e. in ct2.bat: