There are some viruses that avast cannot fix and you may have to reformat ur hard drive. I'm not sure if the virus u listed in the name of ur post is one of them, but it is possible that it is. Also, since its a generic virus, it may be possible that it is a false positive. Have you uploaded it to virustotal.com to check if it is? If not, you can extract it from the chest onto ur desktop and upload it to virustotal to see if it is a false positive or not. If it isn't, an advast admin will have to help you with removal and you will probably be required to download a program named hijackthis from trend micro. You can go ahead and download it now because it is a good tool, but check virustotal first to see if you indeed have an infection.