insmod.static: 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:

/sbin/insmod.static - from package: module-init-tools

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

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