How To Fix Code 40 (Error 40)

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Typically, Code 40 errors are caused by a corrupt or missing 40-associated file, sometimes due to malware infection. Obtaining a new, uninfected copy of your Windows 10 file will usually resolve the problem. As a supplemental troubleshooting step, we highly recommend updating any outdated device drivers that could be contributing to creating these Code 40 error messages.

Typical Code 40 Errors

In Windows, Code 40 errors are associated with a Blue Screen of Death, or "BSOD":

• "A problem has been detected and Windows has been shut down to prevent damage to your computer. The problem seems to be caused by the following file: Code 40."
• ":( Your PC ran into a problem with Code 40 and needs to restart now."
• "STOP 0x000000D1: IRQL_NOT_LESS_EQUAL – Code 40"
• 0x0000001E STOP: KMODE_EXCEPTION_NOT_HANDLED – Code 40
• STOP 0x050: PAGE_FAULT_IN_NONPAGED_AREA – Code 40

40-related hardware or software installations can cause Code 40 BSOD errors. Mostly, Code 40-related errors are experienced during the 40 install process, while a Microsoft Corporation-related software or hardware is loaded, during a 40-related device driver load sequence, or Windows shutdown/startup. Documenting Code 40 BSOD occasions is key to determine cause of the problem, and reporting them to Microsoft Corporation for fixes.

Problem Sources of Code 40

Code 40 BSOD errors are caused by a variety of firmware, hardware, driver, or software problems. Microsoft Corporation hardware or 40 faults can lead to these Code 40 errors in some cases.

More specifically, these Code 40 errors can be caused by:

• Outdated, corrupt, or incorrectly configured Microsoft Corporation/40 device drivers.
• Invalid Code 40 or corrupted 40-related registry key.
• Malware has infected Code 40 (or related 40), creating corruption and Code 40 errors.
• Hardware conflict involving Microsoft Corporation hardware, affecting Code 40.
• Damaged or removed system files after you’ve installed software or drivers related to 40.
• Code 40 blue screen caused by a damaged hard disk.
• Code 40 STOP error due to memory (RAM) corruption.

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