I've run three different antivirus programs: ANG, Avira, Kasperky, even WIndows Defender.....and still getting spam sent out to my yahoo email. Suggestions????
Let's clarify that you are receiving email, and not having it sent from your account. If this is the case then it is not related to a virus on your PC. Somewhere along the line your address was probably confirmed as a valid and now spammers have it. You can create rules in your yahoo mail to deal with spam or you can switch to a new address.
And if it's outgoing mail going to your Yahoo address book, it's very possible that spammers have somehow gotten a hold of your address book and are spoofing the sender address to make it look like it's coming from you.
If you are referring to receiving un-godly amounts of spam at Yahoo, it might be the wonderful world of Facebook. Back when they were making all sorts of changes, my yahoo account was posted publicly and I had to make the privacy setting changes to remove that and my phone number. I only use my yahoo account for miscellaneous sites - 4042, facebook, classmates, ancestry.com., coupon sites, etc., It all began back when FB publicized my email account. Now I can get up to 90 spam emails a day. I went into my yahoo account and set it so anything that ends up in my spam account is deleted immediately. Now I only have the occasional spam that sneaks into my Inbox.