If you get hit with ransomware.... don't panic, and don't reply.

First, you should have at least two browsers installed, so that if one gets locked up by the bad guys, you can go into Control Panel > Programs and Features and click or tap on Uninstall. You will still have the other one to use.

And I'm showing you the above, because Malwarebytes and its Anti-Rootkit and Chameleon tools can literally save your cute little posterior when the mung hits the fan, and please don't ask me how I know for sure. There's a story there, but it's an embarrassing one for a guy my age. Under 'Tools' in Avast, there's also directions for creating a Rescue Disk or USB, if desired.
Above all, don't reply to any requests, and don't provide any information.