Solution installation Error: The request failed with HTTP status 404 Not Found

Getting this error while installing a solution. Before this it was highlighted the Error with IIS pool - impersonation is set to true, i have changed it to false. Now this error is coming ?
may be this URL is not accessible : http://localhost/ReportServer/ReportService2010.asmx
any suggestion?

solved…the ssrs database authentication was set incorrect…