===== Centova Cast Installation ==========================================

Downloading installation system ...
Verifying archive integrity ...
Unpacking archive ...
Beginning installation ...

Checking Centova Cast Common Files ...
Downloading Centova Cast Common Files ...

Verifying archive integrity ...
Unpacking archive ...

Installing Centova Cast Common Files ...

Could not find useradd in /usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/home/server445/bin
Installer exited with error, aborting
Installer exited with error, aborting

Getting this error when installing centova

Are you installing this as root ? what operating system are you running ?

installing as root on a centOS 5.8 64 bits with webmin

Simply do

 which useradd it should output /usr/sbin/useradd .. If that is the case you will need to add the environment path to ur .bash_profile /usr/sbin

As djduck suggested, your PATH environment variable is bad; it should include /usr/sbin if you are logged in as root.