ooooooooooo....very simple...
go to START > RUN
then one window will pop up at the bottom left of ur screen...
type MSCONFIG
then go to STARTUP tab .....
then tick something that related to your antivirus programe...
*for example...if u are using AVG then u must tick the AVGCC ....*
*but very strage...coz antivirus will startup automatically one wohh...*