reiserfsck: 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:

/sbin/reiserfsck - from package: reiserfsprogs

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

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