无法加载文件或程序集'Windows，Version = 255.255.255.255，Culture = neutral，PublicKeyToken = null，ContentType = WindowsRuntime'

After installing vs2012 and updating my vs2010 WPF project I get the following error in WPF designer: Could not load file or assembly 'Windows, Version=255.255.255.255, Culture=neutral, PublicKeyToken=null, ContentType=WindowsRuntime' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515) After installing vs2012 and updating my vs2010