You're off topic for this forum, which is dedicated to Windows Live OneCare.
Support for Windows Live Hotmail - http://support.live.com
Help for Windows Live Hotmail - http://help.live.com
I assume you are using Hotmail.
Click options from the upper right of the main Hotmail screen.
Click More Options from the bottom of the list that appears.
Select "Safe and blocked senders" in the Junk e-mail section.
Click Safe Senders on the next screen that appears.
The next screen will present you with a way to add safe senders and a list of your current safe senders and domains to the right. Highlight any in the list on the right that you wish to remove by clicking them and then click the "remove from list" button in the middle of the page.
-steve