Hi there

The lsnrctl command gives you "bad command" as the lsnrctl executable file is not in the environment PATH variable.
Find where lsnrctl.exe is. lets say it is in c:\oracle\personal\bin. Add it to the environment variable PATH by typing
PATH=%PATH%;c:\oracle\personal\bin;%PATH%

Now the command should work from c:
try this out and see itf it helps.
Have a great day
REgards
Ram.S