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Error message I get

I've been getting this error on my PC all of a sudden and I can't seem to fix it. I've tried running the .NET repair tool and it just doesn't work. It happens each time I boot up my PC and it pushes my CPU quite high.

Any suggestions on what could be causing it?

Extra details:

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

************** Exception Text ************** System.Net.WebException: The remote server returned an error: (404) Not Found. at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request) at System.Net.WebClient.DownloadString(Uri address) at System.Net.WebClient.DownloadString(String address) at ]g0&LF*sX~,Emin0(tar!}nf*.‪‪‬‏‍‬‌‍‌‪‬‫‎‌‬‬‫‏‫‮‎‎‎‫‍‬‎‏‪‫‍‌‮(WebClient , String ) at ]g0&LF*sX~,Emin0(tar!}nf*.‌‫‌‫‎‫‬‍‍‏‪‍‌‌‬‌‪‫‪‍‍​‮(Object , EventArgs ) at System.Windows.Forms.Form.OnLoad(EventArgs e) at System.Windows.Forms.Form.OnCreateControl() at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl() at System.Windows.Forms.Control.WmShowWindow(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.Form.WmShowWindow(Message& m) at System.Windows.Forms.Form.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.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: 4.8.4300.0 built by: NET48REL1LAST_C CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll


CheckUpdate Assembly Version: 1.0.0.0 Win32 Version: 13.9.0.0 CodeBase: file:///C:/Users/Niishaw/AppData/Roaming/EventLog/CheckUpdate.exe


System.Windows.Forms Assembly Version: 4.0.0.0 Win32 Version: 4.8.4270.0 built by: NET48REL1LAST_C CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll


System Assembly Version: 4.0.0.0 Win32 Version: 4.8.4300.0 built by: NET48REL1LAST_C CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll


System.Drawing Assembly Version: 4.0.0.0 Win32 Version: 4.8.4084.0 built by: NET48REL1 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: 4.8.4190.0 built by: NET48REL1LAST_B CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll


System.Core Assembly Version: 4.0.0.0 Win32 Version: 4.8.4320.0 built by: NET48REL1LAST_C CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll


System.Xml Assembly Version: 4.0.0.0 Win32 Version: 4.8.4084.0 built by: NET48REL1 CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.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.

user219095
  • 65,551

1 Answers1

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This is a generic exception dialog that appears under certain circumstances when software running on .NET encounters an error the developers did not account for. It is not a problem with .NET Framework itself.

Here, it's about receiving a HTTP 404 Not Found response. This may simply mean a remote resource was moved away/became unavailable.

The relevant information is visible (and can be copied) when you click the details button. It could help identify the program responsible. You should update your question with this information.

Further information is also visible in Event Viewer in the "Application" log.


From the information you added, we can see that the program in question is located at file:///C:/Users/Niishaw/AppData/Roaming/EventLog/CheckUpdate.exe.

Unfortunately, this means you’re most likely dealing with malware. Please read this Q/A on how to proceed from here: How can I remove malicious spyware, malware, adware, viruses, trojans or rootkits from my PC?

user219095
  • 65,551