Posted elsewhere in here but also added to this message board:
The most common spellchecker for Internet Explorer (which I believe also works with MSN Explorer that you use) can be found on this link:-
The wonderful Google also has a toolbar which includes a spellchecker facility. This is available for Internet Explorer or Firefox and can be found here:
I believe it detects which browser you are using and takes you to the right page (ie if you access this link using Firefox, it will take you to the page to download that version whereas if you access the link using Internet Explorer it will take you to the page to download that version).