I got a suspicious email yesterday, the name of the email was AUTOCAD 2016 products ( I am selling CAD/CAM )PTC ,Solidworks & Bentley Products ,PCB ,ADOBE ,CORLE ,,Electronic ,Architecture. I have never used Autocad, so it looks suspicious to me. The email hadn't gone into trash, so it got opened automatically when i opened the Windows 8.1 outlook. When the email opened my hard drive activated for two seconds. I think i might maybe infected. I ran a startup scan, but avast found nothing.