Hi Dasun,
I've not used Avast but many third party security programs disable Windows Defender by default as its not a good idea to be running two security programs at the same time.
As you have now uninstalled Avast and want Windows Defender working again you'll need to take a look at whether Avast modified a Registry key to disable Windows Defender.
This can be done doing the following:
- Right-click on Start > now left-click on Command Prompt (Admin)
- When the UAC Confirmation window pops up click Yes
- In the command window type or copy & paste the following command:
Code:
reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender"
Press Enter key to execute
If this key has been modified you will see a result similar to the sample image below:
View attachment 3189
Other entries you may see appear could be:
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection]
"DisableBehaviorMonitoring"=dword:00000001
"DisableOnAccessProtection"=dword:00000001
"DisableScanOnRealtimeEnable"=dword:00000001
If you can report back on your reg query results telling me what you see there I can assist you in correcting this in order to allow you to use Windows Defender again.
Regards,
Regedit32