Search Engines

What is going on with search engines? and more specifically google? my website http://www.kolyimmd.co.uk has disappeared from any search.

I have done everything I have read for SEO for my website and to start with this working fine but now it has disappeared.

I submitted my website to google, yahoo and msn and used the search string "football manager demo download forum 2008".

To start with google had me on page four of the uk results and when I changed my entire website to the www version I went to page eight and slowly over the next few days slipped to page nine and ten. I checked today and I can not find the website on the first one hundred pages.

Now yahoo is different I am on position number one on both the worldwide and uk versions. If one yahoo was the number one search engine I would be happy.

I can never find my website on msn unless I type in kolyimmd which is useless.