Where are cookies stored?
In Windows XP, persistent cookies are stored in this folder, where "User" is the name of the logged-in user. In some default Windows XP installations, the user is called Owner:
* C:\Documents and Settings\User\Cookies
By default, \Cookies is a Hidden System folder that you cannot view unless the options at Windows Explorer > Tools > Folder Options > View > Advanced Settings have been set to make Hidden and System folders visible.
Remember that not all cookies are tracking cookies. Whenever you delete all your cookies (by any method), you will lose all the information that websites have stored about your logins and preferences. For example, all the sites where you have checked the "Remember me" box will no longer remember you, and you will have to log in the next time you visit the site.
There are some situations where a website might say that the solution to a problem with their site is to "delete your cookies". If you're able to do it, it's better to find the one cookie associated with that site and delete only it, rather than to delete all of them.