Good evening ZooGal and welcome back to CH
That is good news that MWB and your AV didn't find anything. How is the email issue when you open your browser things back to normal? If things are not acting normal 1 thing that I would do is go to Hotmail and change your password, security questions etc. I also would delete all your temps from all browser(s).
If you think that you still may have a bug you can go to are malware / virus section
http://www.computerhope.com/forum/index.php/board,7.0.html SuperDave and the folks over there can help you out.
If you need any help on how to clean out the temp in your browsers just let us know what browsers & what versions and we would be happy to help you out.
Hope to hear from you soon, Mike