In this article, I will show you how to fix the RunDll error on startup in a Windows 11 or Windows 10 computer. What cause RunDLL errors?

A black screen in Windows 10 can appear at any time during use, immediately after booting, after or during an update due to a Windows update error, and at virtually any other time.

This common error in Windows is an annoying one when it happens, but it can be easy to fix. Here's how to do it.

If you think a recent Windows update or software installation caused the 'Critical Process Died' error, reverting to a recent restore point might fix it. Reset or reinstall Windows.

On Windows 11 (and 10), if the Windows Security app isn't working, you can reset it in multiple ways to resolve the most common issues, and in this guide, I'll explain how.