FBI ransomware locked computer. Help?

My computer has been locked by ransomware masquerading as the FBI.  I can still use the other user account on my computer to run Norton 360 in normal mode, and I have run it in Safe Mode in both accounts.  I have used Norton Power Eraser, to no avail. Please walk me through the removal of this monster. 

Also, I do not understand the prompt below to specify a Norton product and version.  My product, Norton 360, is not listed.  I am choosing one at random just to be able to post this.

Thanks!