Hi all done a bit of digging around found a defrag vb script and a script for create schedule task via group policy. so in the batch file it say if not exist c:\windows\tasks\at1.job 4:00 /every:Su \\domain.com\netlogon\defrag.vbscreated a GPO to run the schedul batch file in the startup script session and then linked to a test OUso after reboot the server it created a schedule task called at1 , happy with the result untill we discover the defrag job stuck causing high CPU usage Created another scripts to kill the defrag job, unfortunate it repeatly creating a new task every time reboot the test sever. in the batch file it say if not exist c:\windows\tasks\at2.job 6:00 /every:M \\domain.com\netlogon\kill_defragappreciate for any suggestionsThanksMr555