I am not able to open SharePoint Central Administrator

I have install all the Required software for SharePoint foundation 2010, VS2010, SQL Server 2008 in windows 7 64 bit,

Everything install properly but when I am going to open central admin from program menu, my IE browser sometimes opens Pagenot Found, sometimes HTTP 500 internal server error, some time Internet Explorer cannot display the page.

Previous by default IIS install 6.0, now I have Changed to IIS7.0 installed and I am trying but not able to solve the IE issue.

What is the Exactly issue in my IIS or browser?