Permlinks Problems

Hi…

Recently I had changed my Permlinks of my site from

http://testsite.com/page id to

http://testsite.com/catagoery/posttitle

After I changing the permlinks, totally SEO is collapsed and there is no visibility in any search engine. any one please help me in this… if we changed premlinks of site, is it effects on site SEO..

Thanks in advance.. 🙂 🙂 🙂