Windows Defender detects and removes this threat.
If this threat asks you to pay a fee or fine, do not pay it. The message is a fraud.
This family of ransomware locks your PC and displays a full-screen message (commonly called a "lock screen").
It pretends to be from a national police force and tries to scare you into paying a fine to unlock your PC.
See the Technical information tab for examples of the lock screen.
Typically, this threat gets onto your PC from a drive-by download attack. It might also have installed itself on your PC if you visit a compromised webpage.
You can read more on our ransomware page.