While nothing is 100% effective, a little hardware and some basic knowledge will go a long way toward protecting you from hackers. Here are a few suggestions: Make sure your business has a commercial firewall in place. Consider installing a Web Filter. Make sure your antivirus software is up to date. Never open e-mail attachments from someone you don’t know. If you receive an e-mail attachment from someone you do know, think before you open it. It’s not uncommon for someone to get a virus that sends itself out via e-mail attachment to someone’s entire address book.