If you are getting messages from your fiends with the subject 'Fotos ' then you are getting forwarded a virus.
The first prevention is not to click on any of the three attatched picture link like Imagens anexadas: DSC_614.jpg - DSC_615.jpg - DSC_616.jpg
This is automated mail sent by the virus to all the contacts of the sender in his/her address book. If your computer is already infected with this virus, then there should be _winnt folder in c: drive or system drive. Safely remove this directory to prevent the virus send this automated mail to your contacts in your address book.
The first prevention is not to click on any of the three attatched picture link like Imagens anexadas: DSC_614.jpg - DSC_615.jpg - DSC_616.jpg
This is automated mail sent by the virus to all the contacts of the sender in his/her address book. If your computer is already infected with this virus, then there should be _winnt folder in c: drive or system drive. Safely remove this directory to prevent the virus send this automated mail to your contacts in your address book.