Hello.
The Hijacker's obviously got a host of your information so you'd want to call your bank, credit card companies and accounts like Amazon which you do online business, report/cancel them and any recent unknown transactions. They may have you contact the FBI. This is a form of extortion. It may be from a foreign country and you should unplug your rig from the internet, remove your important information off the computer to a flash drive and like Cody_Cable said, get DEBAN (Darin's Boot and Nuke) and wipeout the hard drive. You'll need to download Boot and Nuke on a separate computer and flash drive. In fact, you'll need a couple of flash drives for additional use.
Once you removed your important information to a flashdrive, you'll need to scan it on the separate computer to remove the Hijacker's signature. I'd first use Avast! then an antispyware remover and malware remover. Use 'Rouge Killer', TDSSKiller and Malwarebytes later. All are free to use. Spybot, too. Here's the address for Spybot.
https://www.safer-networking.org/dl/
I've used several anti-virus, anti- spyware and anti malware programs (scans) when I worked at the shop several years ago. The ones I've had success with are Avast!, Spybot, Super AnitSpyware, Malwarebytes and Rouge killer. Each has a specific job, I'd use Combo Fix but it doesn't work with Window 10.
The first thing I'd do is get Avast! Free. Get the free program. Download Avast! Free and load it on the separate computer. Remember to use 'Scan All Drives'. You don't want it reoccurring on the another computer.
https://www.avast.com/en-us/lp-ppc-win-01c?device=c&gclid=COSri6HqyssCFZOCfgod8nsOjg
Don't get 'Avast! Free' anywhere else because the host web companies (like download cnet.com) want you to download other programs with 'Avast! Free' you don't need.
1)On the separate computer, go to MajorGeeks. com for advice (to top of page, Support Forum> Malware Removal>Read Me Run Me First) to get instructions on removing malicious software. They will also have instructions on downloading 'free to use' scans and programs.
http://www.majorgeeks.com/
1) If you want to try and save your computer without a total wipe out, put the antivirus tools on a flash drive and load it to the infected computer.
2) Disconnect the internet connection (RJ45) off the infected computer (you don't want the Randsomware to infect your network).
3) Run Avast! first. Use scan for viruses>(drop down) boot scan in Avast ! >set scan settings on 'high' and run it. It will tell you it needs to restart your computer and will run on restart (will run automatically in DOS program black screen). let it run. Doing this will allow it to scan for viruses without booting to Windows. It will stop and give you instructions when it finds a virus. Remove it (delete it and if possible, click 'delete all'). You may see more than a few. When it finishes, it will restart Windows. Before plugging it back into the network, reset your router and modem. Lol. It puts to rest a whole lot of advice dealing with the superstition of hidden viruses.
4) then DO the rest of the Malware Removal Guide from Major Geeks.
Hope this helps.