hivexregedit: 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/hivexregedit - from package: hivex

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

On Debian possible default full paths are:

/usr/bin/hivexregedit - from package: libwin-hivex-perl

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

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