blocking addresses from fake microsoft

Recently i have been getting mails,with microsoft logo saying it’s a upgrade patch.I know it’s a virus.I haven’t opened any of the files,but my problem it that i am tired of blocking the addresses everyday.I get 15-20 mails everyday eachone comming from different address.This is happening with my Yahoo account.
Can somebody tell me what can be done to permanently avoid getting such mails?

Please help!!!!!!

Thanks in Anticipation.