Error 0xc0000005 in Event Viewer: Causes and Fixes

What Does Error 0xc0000005 in Event Viewer Mean

Error 0xc0000005 (STATUS_ACCESS_VIOLATION) in Event Viewer is a memory access violation code logged when an application or process fails. In the Windows Event Log (usually under Windows Logs → Application), you will see an event with the source Application Error or Windows Error Reporting, where the Error code field shows 0xc0000005. This error occurs when a program attempts to read or write data to a memory region it does not have permission to access, or to an unallocated region.

A typical scenario: when launching or running an application (for example, a game, office software, or system utility), it crashes, and a record with Event ID 1000 or 1001 containing this code appears in Event Viewer. The user may not notice immediately, but such events accumulate in the log, indicating system instability.

Causes

Error 0xc0000005 can be triggered by several specific factors. Here are the most common:

1. Corrupted Windows system files — missing or damaged key DLL files (e.g., kernel32.dll, ntdll.dll) due to update failures, viruses, or improper shutdowns.
2. Outdated or conflicting device drivers — especially graphics card (NVIDIA, AMD, Intel), chipset, or peripheral drivers that mismanage memory.
3. Conflict with antivirus or firewall software — some security programs (e.g., Avast, Kaspersky, Windows Defender) may block an application's memory access, mistakenly flagging it as malicious.
4. Faulty RAM (Random Access Memory) — physical defects in RAM modules or issues with slots leading to read/write errors.
5. Application malfunction — bugs in the software itself, incompatibility with the Windows version, or corruption of its files.
6. Malware attacks — trojans or viruses that modify process memory or inject code.
7. Windows Registry problems — corrupted registry keys related to memory settings or applications.
8. Insufficient permissions — running an application without administrator rights on systems with restricted user accounts.

Method 1: Check and Repair System Files

Corrupted system files are a frequent cause of error 0xc0000005. Restore them using the built-in SFC (System File Checker) and DISM (Deployment Image Servicing and Management) utilities.

1. Open PowerShell or Command Prompt as an administrator (press Win + X → select "Windows PowerShell (admin)").
2. Run the command to scan and repair files:

   sfc /scannow
   

   The process will take 10–20 minutes. If SFC finds corruption but cannot fix it, proceed to step 3.
3. Run DISM to repair the Windows image:

   DISM /Online /Cleanup-Image /RestoreHealth
   

   This step may require an internet connection to download source files.
4. After DISM completes, run sfc /scannow again to verify integrity.
5. Restart your computer and check if the error has disappeared from Event Viewer.

💡 Tip: If SFC or DISM finish with errors, try running them in Safe Mode or use a Windows installation media to repair.

Method 2: Update Device Drivers

Outdated or incompatible drivers, especially for graphics cards and chipsets, often cause memory access violations.

1. Press Win + X → select Device Manager.
2. Expand the Display adapters, System devices, and Network adapters categories.
3. For each device (e.g., your graphics card), right-click → Update driver → Search automatically for updated driver software.
4. If Windows doesn't find updates, visit the manufacturer's official website (NVIDIA, AMD, Intel, or your laptop manufacturer) and manually download the latest drivers. Install them following the instructions.
5. After updating, restart your system.
6. Check Event Viewer for new errors.

⚠️ Important: Avoid drivers from untrusted sources. Always use official websites or Windows Update.

Method 3: Disable Antivirus and Firewall

Antivirus programs can block an application's memory access, generating error 0xc0000005.

1. Temporarily disable your antivirus: open its interface (e.g., from the system tray icon) and look for an option like Disable protection or Pause.
2. Disable Windows Defender Firewall (if active): open Control Panel → System and Security → Windows Defender Firewall → Turn Windows Defender Firewall on or off → disable it for private and public networks.
3. Launch the application that previously crashed. If the error disappears, the antivirus is the culprit.
4. Configure exclusions: add the problematic application's folder and its executable files (.exe) to the antivirus exclusions. For Windows Defender: Control Panel → Windows Defender Firewall → Advanced settings → Inbound Rules → create a rule allowing access for the application.
5. Re-enable your antivirus and firewall.
6. If the issue persists, move to the next method.

Method 4: Test RAM (Random Access Memory)

Memory errors from faulty RAM can manifest as 0xc0000005.

1. Press Win + R, type mdsched.exe, and press Enter.
2. Select Restart now and check for problems (save your work before doing this).
3. After reboot, the memory test will start, taking 10–30 minutes. If errors are found, the system will report them after completion.
4. Alternatively, use the Windows Memory Diagnostic tool from the Start menu or download MemTest86 from memtest86.com for a more thorough check (requires creating bootable media).
5. If the test detects errors, try:
   • Reseat the RAM modules, cleaning the contacts.
   • Replace the faulty module (if you have multiple, test one at a time).
   • Try different motherboard slots.
6. After fixing the hardware issue, check Event Viewer.

Method 5: Reinstall the Problematic Application

If error 0xc0000005 occurs only when launching a specific application, it may be corrupted or incompatible.

1. Open Control Panel → Programs and Features.
2. Find the problematic application in the list, click Uninstall, and follow the instructions.
3. After uninstalling, restart your computer.
4. Install the latest version of the application from the official website. Ensure it is compatible with your Windows version (e.g., 32-bit or 64-bit).
5. During installation, choose Complete or Custom installation, including all components.
6. Launch the application and check Event Viewer for errors.
7. If the problem persists, try running the application in compatibility mode: right-click the .exe file → Properties → Compatibility tab → check Run this program in compatibility mode for and select an earlier Windows version (e.g., Windows 8).

Method 6: Configure Data Execution Prevention (DEP) Exceptions

Data Execution Prevention (DEP) is a Windows security feature that can block code execution in protected memory regions, causing 0xc0000005 for some applications.

1. Press Win + Pause/Break → Advanced system settings (or open Control Panel → System → Advanced system settings).
2. In the Advanced tab, under Performance, click Settings.
3. Go to the Data Execution Prevention tab.
4. Select Turn on DEP for all programs and services except those I select.
5. Click Add and browse to the executable file of the problematic application (e.g., C:\Program Files\App\app.exe).
6. Click Apply → OK and restart your computer.
7. Test the application and check Event Viewer.

⚠️ Important: Completely disabling DEP is not recommended, as it reduces system security. Always add only trusted applications to the exceptions list.

Prevention

To prevent recurrence of error 0xc0000005 and other crashes in Event Viewer, follow these recommendations:

• Keep Windows and drivers updated regularly: enable automatic updates via Settings → Update & Security. Check hardware manufacturer websites for drivers quarterly.
• Use reliable antivirus software: install only trusted solutions (e.g., Windows Defender, Bitdefender, Kaspersky) and update their databases. Configure exclusions for critical business applications.
• Verify system file integrity: run sfc /scannow as an administrator monthly.
• Test new software: before installing programs from unknown sources, scan them for viruses and read reviews. Use virtual machines for testing.
• Monitor hardware: run RAM tests (MemTest86) and disk checks (chkdsk /f) every six months to detect failures early.
• Create system restore points: before installing drivers or major updates, create a restore point (Control Panel → System and Security → System → System protection → Create) to roll back if issues arise.
• Avoid overclocking components: unstable CPU/GPU or RAM overclocking often causes access errors. Revert settings to defaults.

Following these steps will significantly reduce the risk of 0xc0000005 errors and improve overall Windows stability.