I was told by a technician friend to take back my 2008 Acer computer,Windows XP to a repair shop.He has no connections with that shop. It WAS IN THE REPAIR SHOP AFTER A VIRUS HIT IT 3 WEEKS AGO. The repairman took off my AVG virus protector and put on AVAST WHICH HAS BEEN CAUSING A BLUE SCREEN TO COME ON, SAYING A PROGRAM IS NOT INSTALLED PROPERLY.TODAY, THE TECHNICIAN told me to HAVE THE REPAIR GUY IN THE STORE to take off Avast cause that is a virus. Is this Avast a virus? Can you please help? I will like to add back my AVG virus protector. It worked fine. Can you please reply soon?