If you're using Microsoft Internet Explorer 6.0 or higher, on the Tools menu, click Internet Options. Then, in the Internet Options window, click the Privacy tab. The default setting is Medium, which allows you to accept cookies. You can move the slider to change the security setting if it is not set to Medium. If the setting is Custom click the Advanced button and make sure both first-party and third-party cookies are set to be accepted.
If you're using Microsoft Internet Explorer 5.x, on the Tools menu, click Internet Options. Click the Security tab. Select the Internet zone and click Custom Level. Scroll to the Cookies options and select Enable.
If you're using Mozilla Firefox 2.0 or higher, on the Tools menu, click Options. Click the Privacy tab and select Accept cookies from sites.