Windows OS

From the Windows/Start Menu > Settings > Update & Security > Windows Security

If you have the green check mark, it means your security is active. You will need to go to each security setting to disable/enable it. 

Unless you didn't disable it and you see other than the green check mark, it means you may have a third party protection. This is a bit tricky to find if you don't know the app/software name. Please check this link for examples.