windows defender

[berniecuddles]

Hi all
i have just installed mcafee internet suite 2009 as my last one run out ,not a problem but when i start up my pc (vista home premium) i get this message from windows defender:
"application failed to initialise 0x800016ba" so i cant use windows defender any ideas how i can cure this please, if you could make it easy to understand as i am not that technical thanks for any help

[berniecuddles]

Its ok i did it myself by going to automatic from manual when i turn the pc on