msnsetup: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/msnsetup - from package: python-msnlib

You may install the required package with command apt-get install {package}

Error in other languages:
msnsetup: bevel nie gevind nie
msnsetup: comandă negăsită
msnsetup: comando não encontrado
msnsetup: commande introuvable
msnsetup: command not found
msnsetup: käsku ei ole
msnsetup: không tìm thấy lệnh
msnsetup: komanda nerasta
msnsetup: Kommando nicht gefunden.
msnsetup: kommandot finns inte
msnsetup: komut yok
msnsetup: nie znaleziono polecenia
msnsetup: níor aimsíodh an t-ordú
msnsetup: no se encontró la orden
msnsetup: no s'ha trobat l'ordre
msnsetup: opdracht niet gevonden
msnsetup: parancs nem található
msnsetup: perintah tidak ditemukan
msnsetup: príkaz nenájdený
msnsetup: příkaz nenalezen
msnsetup: команда не найдена
msnsetup: командата не е открита
msnsetup: 命令找不到
msnsetup: コマンドが見つかりません