File Not Found Error on SharePoint 2010

This could be a permission kind issue after migrate to 2010 from moss 2007.Please have a look at the below references and see whether it helps to fix this issue.

http://social.technet.microsoft.com/Forums/en-US/sharepoint2010setup/thread/bc88cbc8-3830-4bb3-8556-2fa8951c3261

http://girishm.blog.com/2010/07/11/this-item-is-no-longer-available-it-may-have-been-deleted-by-another-user-click-ok-to-refresh-the-page/

http://qdevblog.blogspot.in/2012/04/sharepoint-2010-this-item-is-no-longer.html

http://techtrainingnotes.blogspot.in/2012/02/sharepoint-error-this-item-is-no-longer.html