You need to run the boot scan again and your Norton is corrupted and you need to uninstall it. After you get rid of the virus you can re install it. The (ash) is Avast virus updater and needs permission to update its virus data base. I have gone through the same thing you are before. I ended up reformatting my hard drive and re installing windows.
This usually is not necessary but I reformat regularly any way so I just did it I run my OS on C drive and everything else on other drives so when I reformat and re install I do not loose anything.
You may want to check out the link below it has allot of information about the viruses on the p2p network.
http://www.gnutellaforums.com/showth...threadid=41432