Yahoo indexing duplicate pages of our site

duplicate pages problem on yahoo

[sfseo]

Yahoo indexed duplicate pages of our homepage! These pages do not exist but yet Yahoo indexed them:

http://www.example.com/?=DSL
http://www.example.com/?=BED

I tried creating a 404 page but was not able to do so using Front Page. The next thing I tried is to use a robots.txt file to Disallow: /?

I need some help. any suggestions would be greatly appreciated. thanks! Chris.

[edited by: martinibuster at 8:13 am (utc) on Sep. 29, 2006]
[edit reason] Removed URLs. See TOS [webmasterworld.com] [/edit]