For these issues that you are experiencing when you try to install the plugin, it's necessary to check the system requirements. You can use Internet Explorer but the 64 bit version is not supported. Have you tried using Firefox? Have a look at these links, they might help you out,
If the issue persists, I recommend to reset the browsers plugin with the steps that you can find here
Hope this helps
I keep getting the plugin installation page as well with IE9 32 bit (actually "about" says 256bit, but it's on my 32bit computer)...I've tried EVERYTHING and every which way to intall, etc. I've done an Active X reset as well, and still can't get past the page. I have no problems with FF, but I NEED to get this working with IE9...what am I missing here??