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How to fix "Can't open asio3.sys"?

Alton Alexander
By Alton AlexanderUpdated on June 3rd, 2022

The "can't open asio3.sys" error code is a computer error that occurs when the system is unable to load the Asio3.sys driver file. This file is a critical component of the Windows operating system and is required for the system to function properly. When the Asio3.sys file is missing or corrupted, the system will be unable to load it and will generate the error code. There are a number of reasons why this file may become corrupted or missing, including virus or malware infections, incorrect shutdowns, and power surges.

You are here because you have a question about:

  • can't open asio.sys error code 433
  • asio.sys error code 433
  • can't open asio.sys failed with error code 433
  • can't open asio3.sys error code 433
  • asio3.sys error code 433
  • can't open asio3.sys

1. Restart your computer

  1. Boot your computer into Safe Mode
  2. Open the Command Prompt and type "regedit"
  3. Navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\asio3
  4. Right-click on asio3 and select "Restart."
  5. When your computer restarts, it will attempt to fix can't open asio3.sys.

2. Check for updates

  1. Go to Start > Settings > Update & Security > Windows Update.
  2. Right-click on the available update package for your computer and select Check for updates.
  3. If there are updates available, Windows will check for and install them.
  4. If there are updates available, Windows will also offer to restart your computer to apply the updates.
  5. If you choose to restart your computer, Windows will restart automatically after the updates are applied.

3. Run a virus scan

  1. Open the "Control Panel"
  2. Click "System and Security"
  3. Under "System" click "Virus Protection"
  4. In the "Scan Virus Definitions" window, click "Run a virus scan"
  5. In the "Scan Type" window, click "Full Scan"
  6. In the "Scan Options" window, click "More Options"
  7. In the "Scan Settings" window, click "Scan Options"
  8. In the "Scan Options" window, click "File Types"
  9. In the "Scan Options" window, click "Advanced"
  10. In the "Scan Options" window, click "Check for Updates"
  11. Click "OK"
  12. Click "Close"
  13. Click "OK" in the "Scan Results" window
  14. Click "OK" in the "Scan Completed" window
  15. Reboot your computer

4. Run a system restore

  1. On the computer where can't open asio3.sys is located, open the Start menu and enter "system restore."
  2. On the System Restore window that opens, select the date that you want to restore the system to.
  3. Click on the "Next" button.
  4. On the "Select Restore Point" window, select the point in time that you want to restore the system to.
  5. Click on the "Next" button.
  6. On the "Restore Files and Settings" window, select the items that you want to restore.
  7. Click on the "Next" button.
  8. On the "Finish" window, click on the "Yes" button.

5. Uninstall and reinstall your audio drivers

  1. On your computer, open Windows Explorer.
  2. Navigate to C:\Windows\System32\drivers\asio3.sys.
  3. Right-click the asio3.sys file and click Delete.
  4. Click Yes when Windows asks if you want to delete the file.
  5. Launch the Windows Update service.
  6. In the Windows Update window, click the Check for updates button.
  7. In the Search results window, click the Update Driver button.
  8. In the Update Driver window, click the Driver File button.
  9. In the Select Driver File window, navigate to the location where you copied the asio3.sys file from your computer.
  10. Click the Choose File button.
  11. Click the Open button.
  12. Click the OK button.
  13. Click the Close button.
  14. Click the OK button in the Windows Update window.
  15. Restart your computer.
  16. When the computer restarted, Windows installed the updated audio drivers.
  17. If you still experience the can't open asio3.sys error, you can try to fix the problem by following the steps in the "Fixing Can't Open Asio3.sys Errors" section.

If the answers above didn't work then you should also try:

  1. Disable your audio drivers
  2. Enable your audio drivers
  3. Update your audio drivers
  4. Roll back your audio drivers