If you plan to do any kind of work on the web, it is necessary for you to put anti-virus and anti-spyware on your computer.
Unfortunately the world is full of dishonest people who spend all their time thinking of ways to steal money from others.
You can buy programs, such as Norton Anti-Virus Software or Macafee, or you can download free ones. The one I use is Cloud Panda.
Even with these anti-virus and anti-spyware programs, you must be very careful about what kind of websites you visit and what kind of emails you open. (I will write more fully about dangerous emails in my next post.)