Hello Kiaking, from your description it sounds like your computer is infected with malware. If you are using Windows Live One Care please contact support for help with malware removal. How to reach support -
http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2
If you are not using One Care you are off topic in this forum but you can get help by calling the Microsoft Security Hotline - 1-866-727-2338.
You might also try an online malware scanner:
Windows Live One Care Safety Scanner - http://onecare.live.com/site/en-us/default.htm
Eset Online Scanner - http://www.eset.com/onlinescan/
Kaspersky Online Scanner - http://www.kaspersky.com/virusscanner