There are two different versions of Internet Explorer on the 64 bit version of Win7.. Because the Hotmail site may require Java to open the login window, you need to use the version for which you have Java installed. It's very possible the 64 bit version of IE9 won't work for you.. So try the 32 bit version of IE 9.. But first, be sure you've got the most recent version of Java installed for both 32 bit and 64 bit. Many of those login windows require Java to work correctly. See the link below, agree to the license, then download the Windows x86 and x64 OFFLINE versions. ONce they're downloaded, uninstall all previous versions from your computer and install the new.:

http://www.oracle.com/technetwork/java/javase/downloads/jre-6u30-download-1377142.html

Hope this helps.

Grif