Hi all, I have just replaced new hardisk, before that my pc start up damn slow. Old hardisk been used for more than 5 yrs anyway. Suspected it's time to change new hardisk. I have installed original Win XP Pro SP2 & other softwares to my pc. My problem is after using few days I encounter my pc will auto shut down with no reason. I suspect I brought virus from my office to my home pc as my office server's exe files attacked by virus. But when I scan using Norton Anti Virus, there is no virus found. My pc just shutted down few mins ago. I really keen to know why. Anyone can help??