I can't get Stereo Mix to show. I have an Optiplex 745 Model w/ Windows© 7 Pro. MY Audio card says High Definition Audio Device. And its manufacturer says  Microsoft™. On my Vista it would show, and it was a Realtek device or something. But now, I can't get it to install. I don't know what to do now. I tried using the Device detect program, but it wont work. Here's the error report:

 

PLATFORM VERSION INFO
	Windows 			: 6.1.7601.65536 (Win32NT)
	Common Language Runtime 	: 4.0.30319.296
	System.Deployment.dll 		: 4.0.30319.1 (RTMRel.030319-0100)
	clr.dll 			: 4.0.30319.296 (RTMGDR.030319-2900)
	dfdll.dll 			: 4.0.30319.1 (RTMRel.030319-0100)
	dfshim.dll 			: 4.0.31106.0 (Main.031106-0000)

SOURCES
	Deployment url			: file:///C:/Users/Jared/Downloads/dellsystemdetect.application

ERROR SUMMARY
	Below is a summary of the errors, details of these errors are listed later in the log.
	* Activation of C:\Users\Jared\Downloads\dellsystemdetect.application resulted in exception. Following failure messages were detected:
		+ The system cannot find the file specified. (Exception from HRESULT: 0x80070002)

COMPONENT STORE TRANSACTION FAILURE SUMMARY
	No transaction error was detected.

WARNINGS
	There were no warnings during this operation.

OPERATION PROGRESS STATUS
	* [2/22/2013 4:48:43 PM] : Activation of C:\Users\Jared\Downloads\dellsystemdetect.application has started.

ERROR DETAILS
	Following errors were detected during this operation.
	* [2/22/2013 4:48:43 PM] System.IO.FileNotFoundException
		- The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
		- Source: System.Deployment
		- Stack trace:
			at System.Deployment.Internal.Isolation.IsolationInterop.GetUserStore(UInt32 Flags, IntPtr hToken, Guid& riid)
			at System.Deployment.Internal.Isolation.IsolationInterop.GetUserStore()
			at System.Deployment.Application.ComponentStore..ctor(ComponentStoreType storeType, SubscriptionStore subStore)
			at System.Deployment.Application.SubscriptionStore..ctor(String deployPath, String tempPath, ComponentStoreType storeType)
			at System.Deployment.Application.SubscriptionStore.get_CurrentUser()
			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.