i can do that though a phone would be easier
it was a scam. if you can follow the instructions below for a system restore it might fix it
or if you can download malwarebytes even if you have to do it on another computer and then transfer it on a flash drive and run it that should work as well
first try a system restore. If you can boot into safe mode by tapping F8 repeatedly as you boot the computer it should allow you to do that even if you cant do it in normal mode
System restore instructions - windows 7 or 8 8.1
hold the windows logo key down and hit R
type rstrui.exe in the run box that comes up and hit enter
select restore to an earlier date.
Under the "suggested restore" which is usually not old enough to help is a link for "OTHER RESTORE POINTS"
click that if the suggested ones are not BEFORE THE PROBLEM STARTED
choose a date that is BEFORE you experienced the problem
hit ok / restore
the computer will start to shut down
a restoring settngs box will appear with a status bar
when it finishes your computer will restart with the same settings it had on the date you restored to. your data will not be affected.
It is not perfect. But it fixes a lot of things.