I install windows developer preview yesterday. Can i use store in WDP?
No, you can't.
"NOTE: The preview build does not include every feature shown this morning. Shown but not in the Developer Preview release include the Windows Store, Windows Live Metro style apps, and some of the user interface features."
http://blogs.msdn.com/b/b8/archive/2011/09/13/welcome-to-windows-8-the-developer-preview.aspx
