I am using dell laptop in which the operating system is Windows XP. I am using Norton antivirus. I am getting a small box right side down that please scan the virus. your system may be at risk. I am not able to see or open hidden folders and files, and also the C and D drive from my computer. When I scan it shows the virus "autorun.inf". How can I know that the virus is their in my laptop and how can I remove it totally from my laptop.