reged: 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/sbin/reged - from package: chntpw

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

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