I am unable to access secure websites with Internet Explorer. Veronica White
Sorry, there is no simple solution. First, go the VeriSign site to verify that your browser should work correctly at https/SSL sites. Next, try to repair your version of IE, as described on the Elder Geek site. You need a Windows CD to do this. Microsoft also has a help page: How to troubleshoot problems accessing secure Web pages with Internet Explorer 6 Service Pack 2. Some secure sites, such as bank sites, will only work with IE, but it is worth trying an alternative browser, and both Firefox and Opera are free.
Update: Dave Budd says: "At our (Manchester University) site, we've found that a common reason for being unable to access https sites is that the user is running Norton Internet Security. Sometimes a full product update (not just the definitions) fixes it."