Use a trusted antivirus program like Malwarebytes or Windows Defender to run a deep, offline scan of your system to find and remove the active infection.
Upload the ransom note or an encrypted file to a service like ID Ransomware to figure out exactly which strain hit you.
Do not pay the ransom. Cybercriminals frequently take the money and disappear without providing the decryption key. 🛑 What to do if it is Ransomware