Windows & BSOD · high

How to fix0xC0000005

Access Violation - access denied

What this error means

0xC0000005 shows up as a high-severity Windows operating system fault. The application attempted to access memory to which it does not have access rights. Typical application or driver error. The usual suspects are defective RAM, CPU overheating and malware. Use the steps below to track down and fix the cause.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 4 complete
01Update or reinstall the app

Update or reinstall the app.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02MemTest86

MemTest86.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Antivirus scan

Antivirus scan.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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04Check system files

Check system files.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • Bug in application or driver
  • Defective RAM
  • CPU overheating
  • Malware

Useful Windows tools

These commands open Windows tools. Review any action inside the tool before applying changes.

mdsched.exe