mstregdump: 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 CentOS possible default full paths are:

/usr/bin/mstregdump - from package: mstflint

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/mstregdump - from package: mstflint

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

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