regedit: 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/regedit - from package: wine-common

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

On Debian possible default full paths are:

/usr/bin/regedit - from package: wine

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

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