安装Github for Windows时出现System.Runtime.InteropServices.COMException

我正在尝试安装GitHub for Windows,我收到以下错误消息:

PLATFORM VERSION INFO
    Windows             : 6.0.6002.131072 (Win32NT)
    Common Language Runtime     : 4.0.30319.18052
    System.Deployment.dll       : 4.0.30319.17929 built by: FX45RTMREL
    clr.dll             : 4.0.30319.18052 built by: FX45RTMGDR
    dfdll.dll           : 4.0.30319.17929 built by: FX45RTMREL
    dfshim.dll          : 4.0.41209.0 (Main.041209-0000)

SOURCES
    Deployment url          : http://github-windows.s3.amazonaws.com/GitHub.application

ERROR SUMMARY
    Below is a summary of the errors, details of these errors are listed later in the log.
    * Activation of http://github-windows.s3.amazonaws.com/GitHub.application resulted in exception. Following failure messages were detected:
        + The referenced assembly is not installed on your system. (Exception from HRESULT: 0x800736B3)

COMPONENT STORE TRANSACTION FAILURE SUMMARY
    No transaction error was detected.

WARNINGS
    There were no warnings during this operation.

OPERATION PROGRESS STATUS
    * [04/12/2013 08:29:27] : Activation of http://github-windows.s3.amazonaws.com/GitHub.application has started.

ERROR DETAILS
    Following errors were detected during this operation.
    * [04/12/2013 08:29:27] System.Runtime.InteropServices.COMException
        - The referenced assembly is not installed on your system. (Exception from HRESULT: 0x800736B3)
        - Source: System.Deployment
        - Stack trace:
            at System.Deployment.Internal.Isolation.IStore.GetAssemblyInformation(UInt32 Flags, IDefinitionIdentity DefinitionIdentity, Guid& riid)
            at System.Deployment.Internal.Isolation.Store.GetAssemblyManifest(UInt32 Flags, IDefinitionIdentity DefinitionIdentity)
            at System.Deployment.Application.ComponentStore.GetAssemblyManifest(DefinitionIdentity asmId)
            at System.Deployment.Application.ComponentStore.GetSubscriptionStateInternal(DefinitionIdentity subId)
            at System.Deployment.Application.SubscriptionStore.GetSubscriptionStateInternal(SubscriptionState subState)
            at System.Deployment.Application.SubscriptionStore.CheckAndReferenceApplication(SubscriptionState subState, DefinitionAppId appId, Int64 transactionId)
            at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestDirectBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
            at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options)
            at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut, String textualSubId, String deploymentProviderUrlFromExtension, BrowserSettings browserSettings, String& errorPageUrl)
            at System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state)

COMPONENT STORE TRANSACTION DETAILS
    No transaction information is available.

有谁知道是什么原因造成的？