Visual studio Express 2012 running issues in Windows 8 Release preview for Windows Store Apps

I am using Windows 8 Release Preview 64 bit Operating system for my Visual Studio Express edition 2012 for Windows Store Development. But the XAML design page is not working. It is getting Error is

System.Exception Package failed updates, dependency or conflict validation. (Exception from HRESULT: 0x80073CF3)

The alert box is showing as There are Deployment Errors When i try to execute any Project it is showing the displaying error is

The project "App1" needs to be deployed before it can be started.

Verify the project is sekected to be deployed in the Solution Configration Manager, or deploy it explicitly by clicking one of the Deploy commands in the Build menu.

Then finally error is

Registration of the app failed.Windows cannit install package b048fc10-8037-494c-8b3f-0191a2c1bf33 becaus this package requires a higher Windws version. The package requestedWindws version. The package requested windws version 6.2 with AppModel verison ,While the current Windows version is 6.2 with AppModel verison 0.(0x80073cfd)

Can any one help me to debug the error.. It's important.

You are definitely going to run into issues running RTM software (VS) on the pre-release OS. My best advice to you is to get the release version of Windows 8.

If that's not possible, you can open Package.Appxmanifest with the XML editor in visual studio. In there you'll find a Prerequisites section containing the minimum and maximum OS version. Change the values there to 6.1.0 (IIRC) and your app should run.

WARNING The behaviour of your app is not guaranteed though - changes in the OS between release candidate and RTM mean that some behvaviour has changed, and some may not be supported on the older version at all. Proceed at your own risk.