Wait. Let me guess. You will say "I'm at work and we only have IE" but that is no excuse. You can get Firefox Portable in one of your thumb-drives (I'm sure you have at least one) and use it anywhere without installing it on your work computer! Why take the risk when you can use open source software with its code made available to the general public, making sure that there are no spyware inside, and promote the freedom of information?
Better yet, go open source for the rest of your applications as well and stay safe all the time!