1. Run the Installation Assistant as Administrator

• Right-click the Windows 11 Installation Assistant
• Select Run as administrator

2. Disable Security Software Temporarily

• Turn off Windows Defender Real-time Protection:
• Go to Settings > Privacy & Security > Windows Security > Virus & Threat Protection > Manage Settings
• Disable third-party antivirus via system tray icons

3. Free Up Disk Space

• Ensure 64GB+ free space (official requirement is 64GB)
• Use Disk Cleanup to remove: Windows Update cache Temporary files System restore points

Advanced Troubleshooting

4. Repair System Files

1. Open Command Prompt (Admin)
2. Run these commands sequentially: sfc /scannow dism /online /cleanup-image /restorehealth
3. Restart your PC

5. Update Device Drivers

• Chipset (download from motherboard manufacturer)
• Storage (Intel RST/NVMe drivers)
• TPM (Trusted Platform Module)

6. Modify Registry Settings

1. Press Win + R, type regedit
2. Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
3. Create a new DWORD (32-bit) Value named EnableLinkedConnections
4. Set value to 1

Prevention Tips for Future Upgrades

• ✔ Create a system image backup before major updates
• ✔ Use Microsoft's PC Health Check to verify compatibility
• ✔ Maintain 20% free disk space at all times
• ✔ Document your BIOS settings before making changes

When to Contact Microsoft Support:

• If error persists after all troubleshooting steps
• When upgrading enterprise-managed devices
• If hardware compatibility issues are suspected

Did You Know?

Error 0xc0000005 typically indicates:

• Memory access violations (faulty RAM or addressing errors)
• Driver conflicts with the installation process
• Corrupted system files preventing proper execution

For time-sensitive upgrades, consider:

1. Clean install using Media Creation Tool
2. Resetting Windows Update components
3. Checking motherboard manufacturer for UEFI updates

Need specific help? Share your:

• PC model/motherboard
• Current Windows version
• RAM/Storage configuration