Errors such as the above title are meant to help the programmers determine the root cause of an issue with any running software. In cases where programmers are not at our disposal, we have to discover why these errors appear on our own and resolve them manually.
Ranging from annoying to downright crippling, these errors should never be ignored, as they generally point to a persistent issue that should be fixed right away. In the case of the 0x40000015 error, it is in most cases a sign of a botched installation of a non-critical program or, rarely, a damaged system file. To resolve the 0x40000015 error, follow the methods below.
Method 1: Check if your antivirus software is out of date
In cases where the 0x40000015 error appears immediately upon or shortly after the launch of the operating system, one possible cause is the outdated or damaged antivirus. Try uninstalling and reinstalling the currently active antivirus to see if the problem persists. If it does, proceed to the next method.
Method 2: Remove unneeded programs
Some programs have a delayed startup and might cause the 0x40000015 error to appear a few minutes or hours after booting without giving any clue as to which of them caused it. In such cases, you should perform a clean boot by following the steps found here. The clean boot will temporarily disable all non-essential programs and allow you to see if one of them is the culprit. If the error doesn’t appear after the clean boot, the most likely issue is that one of the disabled programs is causing the error.
The ideal solution then is to go back and enable programs one by one, restarting the device after each change, and see when the error appears, which should point to the root source of the issue. If the error appears even after you’ve done the clean boot, then the most likely cause is irreparable damage to the operating system, in which case it needs to be installed anew.