OK, since the problem occurred, have you installed or updated any software, maybe anti virus/Internet security suite software perhaps?
IE doesn't have add-ons like FireFox, so it's not that.
For starters, let's completely reset IE back to its defaults. Firstly, by default, IE does not display the menus. To show the menus, press the F10 (function 10) button once. Now click on:
Tools > Internet Options > General tab
You'll see this:
http://www.macro-images.com/web/help/help1.jpg
Under the "browsing history" section, click the delete button (circled in the above image).
You'll now see the following window:
http://www.macro-images.com/web/help/help2.jpg
I'd strongly suggest clicking the "Delte all..." button. Please be aware that this will also get rid of all remembered passwords etc. So - make sure you know your passwords. IMHO, never rely on a machine to remember your passwords.
You'll now see the following window:
http://www.macro-images.com/web/help/help3.jpg
Tick the tick box for "Also delete files..." and then click the Yes button.
It'll take a minute or so to do all of the necessary things. IE won't respond until it's finished. Once done, my next suggestion is to reset IE to its factory defaults. To do this, click on the Advanced tab. The window will now look like:
http://www.macro-images.com/web/help/help4.jpg
Click on the "Reset" button. Follow the prompts, it's pretty straight forward.
Once this is all done, close the browser, reboot the computer and then re-test with the iceinspace.com.au website.
Let me know how you go.
Dave
PS I can upload a copy of FireFox to my website and provide you with FTP instructions if you want so you can download it if you're having problems downloading programs, etc. Let me know.