Windows Phone: Deployment of application to device failed. Exception from HRESULT: 0x89721800

I'm developing a windows phone application on Visual开发者_开发百科 Studio 2010, Windows 7 virtual environment. I've setup Visual Studio to Run as an administrator. Every time I try to run the windows phone 7 application, it gives me this error:

Windows Phone: Deployment of application to device failed. Exception from HRESULT: 0x89721800

THe only two solutions I found so far are: run as admin (which I am doing) and delete the .user and .suo file (I deleted the project's .user file but didn't see a .suo file anywhere).

Any ideas?

Thanks.

Download this archive (the CoreCon folder containing the valid datastore). Delete the contents of the 10.0 folder (leave the folder itself intact) and extract the files you just downloaded in it.