wbemgc: 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/wbemgc - from package: sblim-wbemcli

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

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