i believe my pc is hit by some tough virus, coz even after i format my pc for 4 times, there is still pop up from my norton saying there is a virus like W32.Gaobot.gen!poly and W32.Randex.gen which after deleted, they just keep coming back again. this is veli frustrating and i have tried a couple antivirus program but none detected anything. i suspect maybe it can be hidden somewhere? Please note that the situation occurs again even after i format my pc. And the most worrying thing is my pc is going slower and slower.. apprieciate it if anyone kind expert would help me around. thanks.