Google said something wierd is going on on my computer...
Today, when I woke up I had Google notice on my gmail account that something wierd is going on on my computer. I had to enter my telephone number, then Google sent me SMS with code so that I could enter my account. Then I had to change my password. In my mailbox I found that someone was sending mails from my e-mail acccount. How is that possible? Did someone break in my iMac? Do I need additional software for Firewall and Antivirus?
Thank you in advance for your answers.
Kind regards,
Klemen
Mac Pro, Mac OS X (10.6.7)