I have trusted avast for abut five years. But I'm not so sure what I should think anymore :/ I have installed Windows XP on a virtual machine, and install avast on that machine. I have used malwaredomainlist.com (the site is safe, but it has links that are unsafe) to download viruses, and avast hasn't detect much of the threats. Maybe 2 of 11. What should we do about this? Any suggestions? I have all the vuruses in a VHD file.