Uh, it seems trhat you have at least two Viruses. A w32.Blaster (make a boardsearch for blaster) http://www.avast.com/forum/index.php?board=4;action=display;threadid=848;start=7 and: http://www.avast.com/i_idt_1372.html and the MS Patch: http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS03-026.asp
What file is identified as trojan-gen?