the best anti virus to use on any of the windows operating systems is Avast anti virus, it updates every day, picks up every known virus, u can do a dos based scan on boot so it guarentees virus removal, i work for a computer company and we fix 30 systems a day many of witch have virus problems and this removes everything with a boot time scan and seems to even pick up viruses that kapersky, panda, norton, mcaffe, avg and many other progs seem to miss