5/5 Virus Threat from my Email

From my Yahoo!Mail particularly. Every weekend is the schedule of the computer to have its  complete thorough virus scan. Yeah right, that takes more than eight hours of scan because a lot of programs installed and every little thing, the amazing anti-virus/anti-spyware software does it. It is worth the time though than just the short-scan thing so the first one is preferable. Then I did what it has to do, let it scanned but at the same time yours truly opened the windows too. Checking and alike. It's just alright. Not until a spam message I read and tempted me to opened it. I was confident because of the Norton antivirus thing which examines such. And it did. It was not a threat according to Norton but Windows Defender warns that a maximum threat was detected. Geezz.. and you know that spam thing did. It slows my browser and there's that script warning. Then it slows down my windows. I prompted to close it. And never open anymore until my anti-virus/anti-spyware done. All in all, it was fine. But lesson learned, never open attachments anymore when I(you) don't know who sent it!  Good thing I have a reliable software or else! Think of the worse will happen, if not or next time! Mark my word! " Never ever open mails or attachments if you do not know who sent or expect to receive it! " Or just prepare for the consequence.