i am unable to shut down my vista system and i know its some driver problem.but still

i am unable to shut down my windows vista premieum, i had to shut down it mannually every time. through contro panel - advanced tools i found theese problems it said some driver are causing windows to stand by or hibernate slowly but hibernation is ok i am not able to shut down the system anyways the driver is intel wireless wifi link driver with name NETw432.sys,and also it stated that the driver intel graphics kernel mode with name igkmd32.sys is causing the windows to resume slowly. so any idea how to cope up this shut down plight.