First, go to the following site and check to see if you have Java installed:
http://www.pocoso.de/pocoso052.html
Start by clearing the IE cache and see if that resolves it. Open Internet
Explorer, go to Tools, select Internet Options, on the General tab click
Delete Cookies, Delete Files and accept the option to delete all offline
content and Clear History.
In addition to the above, if you are blocking cookies try accepting them.
In IE< go to Tools, select Internet Options, go to the Privacy tab, click
advanced and set cookies to accept and see if you can get in. Note, some
firewalls have their own cookie blocking features and might override those
settings so if you have a firewall, you might want to disable it when trying
to access these sites.
For advice specific to problems with secure sites, have a look at the first
link - for general advice, have a look at the second:
http://www.mvps.org/inetexplorer/answers2.htm#secure_sites
http://www.mvps.org/inetexplorer/answers.htm#dns
Also, you don't say if you've ever been able to access this site. If yes
and this is a relatively recent issue, you might try using System Restore to
take you back to a time when you had access: Start\All
Programs\Accessories\System Tools\System Restore.
