The web server can send a cookie to your computer, which becomes stored on your hard drive. Then when you visit additional sites, you may be picking up more cookies. The cookie is a record keeping system that keeps track of all the websites visited, ID number, time of your visits and any other information that you give up willingly such as your password or e-mail address. The problem is that too many cookies make you more vulnerable to losing data and acquiring a virus. Many websites now offer their customers guaranteed secure server environment for online procurement. Commerce would otherwise suffer because customers are very careful about relinquishing their credit card information.
The protection that commerce websites offer help when you are about to make a purchase but in no way do they protect you from viruses. The fear that everyone keeps is that those who track their every move through cookies can retrace their steps and send a dangerous viruses to destroy their computer. Your computer is an open book to a professional hacker without the proper stops put into place. You should make sure that you have an anti virus program and keep it up dated at all times. The personal firewall is very important as a back up protector.
Macro viruses are the most harmful and that about 75% of all viruses are macro. This virus spread by shared documents and grows every time you create a new document. The hacker who sends you the virus has it embedded in your system without your knowing making it possible for you to spread the virus to others in your network. The next most dangerous method of receiving a virus is by your email attachments. It is advisable that you do not open any attachment sent to you by someone you do not know. We are confronted with over tens of thousands of viruses known to destroy your computer and all the information that it obtains the data that you keep should always be protected that is why it is important to maintain a good antivirus program and a personal firewall. The hackers are ever diligent working hard to break through firewalls but luckily major companies work just as hard to keep us protected. We need to back up any important information and keep on file in a CD in case your system is exposed to a virus.
Source by Josh Carlton