Your PC is your first line of defense on the Internet, and with just a couple of tools and some diligence, you can greatly improve your security.
Make sure your computer has both an anti-spyware protection program that detects and removes spyware and an anti-virus program. Keep both programs updated.
Be very protective of your personal and account information. There are criminals who try to trick you by creating sites that look similar to real sites. The best way to know whom you are dealing with is to type the address in your browser address bar.