When you visit a webpage or do searching from a search engine, you're particularly vulnerable. Because the website will have a record of all of your activities or searches. It uses cookies to track you from session to session. To prevent this, you can frequently delete cookies from your computer. But cookies can be quite useful, for example by logging you in to some sites automatically, or saving your preferences on how you use sites. For example, when you log in your Blogger account, Blogger create cookies on your PC with information allowing you to access your account. After deleting your cookies, if you want to go to another section in your account, Blogger will ask you for user name and password again.
There is a simpler solution for this problem. That is to block only some websites from placing cookies on your PC. Here I only talk about how to do it in Internet Explorer 7 and Firefox 2 . Other browsers are left for you.
In Internet Explorer 7, you choose Tools-->Internet Options, then click the Privacy tab, continue by clicking the Sites button. 
In the "Address of website" box, type in the website's URL you want to block( you need not to type the http:// in the address box, for example, www.donotplacecookies.com) and click Block (see image). From now on, when you visit that site, it won't be allowed to place a cookie on your hard disk, and it won't be able to track your activities or searches.
In Firefox 2, you start by selecting Tools-->Options, select the Privacy tab, and then click Exceptions. Then type the website's URL you want to block into the "Address of Web site" box and click Block.
For others browsers, you can use this same technique to keep cookies off your hard disk as well.
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