To secure your computer from malware and other threats, you might have installed the Avast antivirus software on your computer. This software has a feature to scan your computer when it starts. The feature is known as Boot-Time Scan. When you schedule a Boot-Time Scan, the Avast antivirus scans for malware in your operating system when it is started the next time.While running a Boot-Time scan using Avast antivirus on your Windows computer, if you receive the Error 0xc000009c, then it is related to the system files damage on your computer.
Some solutions given below will help you troubleshoot the Avast Boot Scan Error Code 0xc000009c.
The error code 0xc000009c might have been triggered by the third-party drivers or the drivers that have not been updated. To update the drivers on your Windows computer using Windows Update, follow the below steps.
Try the Avast Boot-Time scan again.
To troubleshoot the Avast Boot Scan Error Code 0xc000009c, you can perform an SFC scan on your Windows computer. The steps for the SFC scan are given below.
You can uninstall the Avast antivirus on your computer either using the Avast Uninstall Utility or the Control Panel on Windows computer.
To uninstall Avast Antivirus software on your Windows computer using Control Panel, follow the below instructions.
If the methods specified above did not work, then try the alternative solutions given below.
Your system might have been corrupted with the virus, which is not allowing the activation process. So try to scan your computer with the in-built Windows Defender.
In some cases, if the drivers on your computer are not updated, then it may trigger such Avast Boot Scan Error Code 0xc000009c in your antivirus program. So check your Device Manager for updates and update all those drivers.
If your computer has another antivirus software running, then that would block Avast antivirus. So, uninstall the other antivirus and then try to activate your Avast antivirus.