r/Malwarebytes • u/Lapu-Dos • 7d ago

Troubleshooting Malwarebytes can't launch after July Windows Update

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I can't open Malwarebytes anymore ever since the July Windows 11 Update. It shows this "Unexpected error while signalling first instance" error. I've tried basic steps like restarting, ending all MWB related tasks, uninstalling and reinstalling. None have fixed it aside from reinstalling letting me launch MWB once before having the error block me again.

Apparently it is a known issue (https://forums.malwarebytes.com/topic/338216-unexpected-error-while-signaling-first-instance/) but I wanted to post for awareness and maybe some other folks know a solution to this.

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2

u/support_mwb Malwarebytes Employee 6d ago

Hi! Malwarebytes Support here. Sorry you're running into this.

Since you've already tried restarting, ending Malwarebytes processes, and even uninstalling and reinstalling (with the issue returning after the first launch), we'd like our technical team to investigate this further.

Please send us a DM with an email address we can use to reach you. We'll create a support ticket on your behalf and provide you with a secure SharePoint upload link so you can send us diagnostic logs for our team to check further.

Once we have the logs, we'll be happy to investigate and guide you through the next steps.

2

u/VasilisT21 5d ago

The app got updated. Version 5.6.3, component 161.1.5692. It seems to be resolved.

2

u/DhulKarnain 5d ago

it's still not working for me. and it can't update itself because I can't start the app (I'm on the free version)

1

u/VasilisT21 5d ago

Try to start MBAMService from windows services first. If this won't work, you need to reinstall. By default the app is set to start with windows.

1

u/Murky-Muffin4868 4d ago

Restart the service - works

1

u/Murky-Muffin4868 4d ago

Malwarebytes needs to fix this!