VIRUS (LsAs.Blaster.Keylogger)?

Hello David C, you are not infected with a keylogger virus.What you have is a fake/rogue program that is telling you this,in order that you purchase winweb.Avast,like all other free AV's will not remove this threat.There is one particular program that specialises in removing this kind of threat,MalwareBytes AntiMalware.Please google this program,if you are unsure.The link provide is very detailed,and provides download links.( or use the links from soccer dave )It makes a change for someone to be polite,when asking for help.Merry christmas.