My home page in Internet Explorer is set for www:MNS.con, when I try to open it switches to Gaterway Search Page.

With your web browser open, click on tools.

Click on internet options at the bottom.

Enter the home page address you want in the address box at the top of the window.

Click apply or OK.

If it changes after that, you probably have some type of virus or spyware at work.

"www:MNS.con" is not a valid URL. Are you trying to go to MSN.com (http://www.msn.com?) Be sure to type the URL exactly when you follow the steps progunr suggests.