kded: 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/kded - from package: kdelibs3

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

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