How To Fix Code 21 (Error 21)

Windows 10 problems with Code 21 most often stem from a corrupt or missing 21 file. If your Windows 10 file is suffering from one of those troubles, replacing it with a fresh file should resolve the issue. As a supplemental troubleshooting step, we highly recommend updating any outdated device drivers that could be contributing to creating these Code 21 error messages.

Classic Code 21 Problems

Code 21 issues generally involve a Blue Screen of Death error, also known as "BSOD" or "Stop" error:

• "Code 21 error has caused Windows to shut down to prevent computer damage."
• ":( Windows encountered a problem with Code 21 and needs to restart."
• "0x0000000A: IRQL_NOT_LESS_EQUAL – Code 21"
• 0x0000001E STOP: KMODE_EXCEPTION_NOT_HANDLED – Code 21
• 0×00000050 STOP: PAGE_FAULT_IN_NONPAGED_AREA – Code 21

In many cases, Code 21 errors causing a Blue Screen of Death occur after 21-related installation of hardware or software. Ordinarily, Code 21-related Blue Screen errors happen when a Microsoft Corporation-related device driver is loaded, during the install of 21 or related program, or while Windows is starting or shutting down. Keeping track of when and where your STOP error occurs is a critical piece of information in troubleshooting the problem.Notating when Code 21 STOP errors happen is paramount in finding the cause of the 21-related problems and reporting them to Microsoft Corporation for help.

Origins of Code 21 Troubles

Code 21-related Blue Screen of Death errors are caused by associated software, hardware, firmware, or device driver issues. Microsoft Corporation-associated hardware or 21 itself can lead to these problems.

Specifically, Code 21 issues caused by:

• Poorly configured, outdated, or corrupted device drivers (Code 21).
• Invalid Code 21 or corrupted 21-related registry key.
• Malware infestation corrupted Code 21 file or associated 21 files.
• Hardware conflict after installing new Microsoft Corporation hardware, or hardware related to Code 21.
• Damaged or removed system files after you’ve installed software or drivers related to 21.
• BSOD of Code 21 created by damaged hard drive.
• Code 21 STOP error created from RAM memory corruption.

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