Source: Insafe

In order to prevent malware from entering PC it is important not to open any emails which come from senders you don’t know. Many of those emails have titles like “You have won a lottery” or “Happy birthday, I have a present for you” and so on. Never open any attachments coming with such emails, as it is likely that in such cases you will install a virus or a worm in your PC. As a rule, you should never open an attachment that has been sent to you by someone you don’t know. Try to avoid suspicious websites, and if you accidentally enter one which seems strange, leave it immediately. If pop-up windows alert you or ask you to agree to anything, immediately close them and never click on any button inside them.

Source: Insafe