My pc always restarts even if i press the shut down button

on my my windows xp when i am pressing the shut down button the pc suddenly restarts what to do !! i have a petium 4 , intel dual core 2.2 , 2gb ram!! please i need quick help
Answer #1
Try these:
http://www.technipages.com/pc-restarts-when-shut-down-is-clicked.html
http://support.microsoft.com/kb/320299
http://support.microsoft.com/kb/311806
Good luck.
Answer #2
check this one
http://support.microsoft.com/kb/320299
http://www.kellys-korner-xp.com/win_xp_restart.htm
Answer #3
thank you mate this was quite helpful to me thank you once more !
Answer #4
CASE SOLVED