You cal also try to run command:

sfc /scannow

Seems, like you have a .Net Problem.

You can search for following installed Updates:

KB2966826
KB2966827
KB2966828

and uninstall them. Try if it works, when not, reinstall .Net.

Another possibility is, that you have to disable USB 3.0 Support in BIOS for your Mainboard.

I cant give more tips based on those few Informations about your enviroment.

installed the kb's but not result

you have to UNinstall them.

ok, but they wasnt installed

and you tried:

sfc /scannow ?

You uninstalled complete .Net Framework and installed it again?

You rebooted?

You Only answered to the KBs

sfc brings no error

.net uninstalled and installed

i also installed my Client completely new

i rebooted

Hi @all,

OS Windows 8.1 inkl. Feature HyperV installed

HyperV Manager -> New Virtual Machine -> Gen2

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
   at System.ComponentModel.ReflectPropertyDescriptor.SetValue(Object component, Object value)
   at System.Windows.Forms.RadioButton.PerformAutoUpdates(Boolean tabbedInto)
   at System.Windows.Forms.RadioButton.set_Checked(Boolean value)
   at System.Windows.Forms.RadioButton.OnClick(EventArgs e)
   at System.Windows.Forms.RadioButton.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34209 built by: FX452RTMGDR
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
----------------------------------------
Microsoft.ManagementConsole
    Assembly Version: 3.0.0.0
    Win32 Version: 6.3.9600.16384
    CodeBase: file:///C:/windows/assembly/GAC_MSIL/Microsoft.ManagementConsole/3.0.0.0__31bf3856ad364e35/Microsoft.ManagementConsole.dll
----------------------------------------
MMCFxCommon
    Assembly Version: 3.0.0.0
    Win32 Version: 6.3.9600.16384
    CodeBase: file:///C:/windows/assembly/GAC_MSIL/MMCFxCommon/3.0.0.0__31bf3856ad364e35/MMCFxCommon.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34239 built by: FX452RTMGDR
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34209 built by: FX452RTMGDR
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34209 built by: FX452RTMGDR
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Configuration
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34209 built by: FX452RTMGDR
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34230 built by: FX452RTMGDR
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
Microsoft.Virtualization.Client.VMBrowser
    Assembly Version: 6.3.0.0
    Win32 Version: 6.3.9600.16384
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Virtualization.Client.VMBrowser/v4.0_6.3.0.0__31bf3856ad364e35/Microsoft.Virtualization.Client.VMBrowser.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34209 built by: FX452RTMGDR
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
Microsoft.Virtualization.Client.Common
    Assembly Version: 6.3.0.0
    Win32 Version: 6.3.9600.16384
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Virtualization.Client.Common/v4.0_6.3.0.0__31bf3856ad364e35/Microsoft.Virtualization.Client.Common.dll
----------------------------------------
Microsoft.Virtualization.Client.Management
    Assembly Version: 6.3.0.0
    Win32 Version: 6.3.9600.16384
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Virtualization.Client.Management/v4.0_6.3.0.0__31bf3856ad364e35/Microsoft.Virtualization.Client.Management.dll
----------------------------------------
Microsoft.Virtualization.Client
    Assembly Version: 6.3.0.0
    Win32 Version: 6.3.9600.16384 (winblue_rtm.130821-1623)
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Virtualization.Client/v4.0_6.3.0.0__31bf3856ad364e35/Microsoft.Virtualization.Client.dll
----------------------------------------
System.Management
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34209 built by: FX452RTMGDR
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/System.Management/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Management.dll
----------------------------------------
Microsoft.Virtualization.Client.Wizards
    Assembly Version: 6.3.0.0
    Win32 Version: 6.3.9600.16384
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Virtualization.Client.Wizards/v4.0_6.3.0.0__31bf3856ad364e35/Microsoft.Virtualization.Client.Wizards.dll
----------------------------------------
Microsoft.Virtualization.Client.Settings
    Assembly Version: 6.3.0.0
    Win32 Version: 6.3.9600.16384
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Virtualization.Client.Settings/v4.0_6.3.0.0__31bf3856ad364e35/Microsoft.Virtualization.Client.Settings.dll
----------------------------------------
Accessibility
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/windows/Microsoft.Net/assembly/GAC_MSIL/Accessibility/v4.0_4.0.0.0__b03f5f7f11d50a3a/Accessibility.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

Anybody an idea?

THX, Greetz

• Moved by Teodora MilushevaMicrosoft contingent staff 3 hours 30 minutes ago Language

Try to create with Powershell:

New-VM -VMName (Name of VM) -Generation 2

This command works but in Assistant i got this error.

Anybody a idea?

Greetz

Can you post an screenshot of errormessage?

Okay. you disabled USB 3.0 in BIOS? have all drivers up to Date?

hi, i tried to deactivate but no result

i dont understand how deactivating usb3 will solve a Problem in hyperv?

yes, Drivers are up to date