There seems to be an increase in these types of scams. Especially Ransomware.
What is Ransomware? Ransomware is a type of malware that prevents or limits users from accessing their system, either by locking the system's screen or by locking the users' files unless a ransom is paid.
What can be done? First of all don't fall for it. Lets imagine that you do actually pay these scammers the money demanded, how do you know they will remove anything or just ask for more money from you? Plus by doing so you are giving the scammers more information, not a good move.
Sometimes it seems that your computer is locked and you cannot do anything except do as they say. WRONG!
You can always close down your computer by pressing the power button for several seconds and this will close down your computer.
Second step- run an anti virus program.
Third step- Change your password.
It is always helpful to run Ccleaner from Piriform to clean out any residual nasty bits. It is available in a free version for Pc's and macs.
After taking ALL these steps it is a good move to change your password again, and run another AV scan for your peace of mind.
As a further precaution do regular back ups so that you can always do a re-install in case anything is lost. This is especially important if you run a business so that you can always recover the information you need to keep a business up and running.
Information about removing this malware.
https://easyquickremoval.com/2018/11/how-to-delete-1gxazhvqudjetpe62ufozfibpa8todoun3-malware/
And other variations. https://duckduckgo.com/?q=+1GXazHVQUdJEtpe62UFozFibPa8ToDoUn3&t=ffhp&atb=v130-3&ia=web
Some of these fixes may involve buying some products. You can try some of the free ones first like sophos.
https://www.sophos.com/en-us.aspx