If you're using Internet Explorer 8, try turning off the Pop-up blocker or better yet, download a second browser such as the free Firefox below and see if it works with Firefox as the default browser. (Be sure to make Firefox the default browser because clicking on a link in your email will use the default, even if it is unsafe to do so.)

http://www.mozilla.com/en-US/firefox/

Hope this helps.

Grif