Internet Explorer window defaults

I am not sure how it happened but when you click the iconto open the Internet Explorer 6 window it defaults to the taskbar at the bottom of the screen. The only options I have are either open or minimize to the taskbar. I do not know how it was set to this. How do I undo this? I want to be able to make the windows small so I can size windows to tile. Not an option right now. Please help! I have Windows XP Pro. and this did not start happening until about a month ago. I have had XP on my system since it came out. All my security patches and updates are current.