g'day and welcome to the forums.
all may not be lost, not yet anyway.
usually when Windows has profile errors, it still logs you in under a temporary profile it creates every time you log in - are you getting that far?
if so, once in, go to Start > Settings > Accounts > Family and Other Users > Add someone else to this PC
create a new User and sign back in using that account. once in, go to C:\users\{your original profile}\ and copy your Docs, Pics, Downloads, Desktop, etc folder to the new profile.
if you are not even getting into Windows, another option is to start the PC, and as soon as you see the Windows logo, hold in the power button to force the PC off.
repeat that process about 3 times and eventually Windows will show a "hang on a sec, what are you doing?" sort of error and take you into the Advanced Startup Options menu.
from there you go into Advanced and could either try a restart into Safe Mode, or a Repair this PC.
@PeterOz has a neat little profile fixing tool (which I tried to search for and failed) but I think it relies on you being able to get into Windows.
let's see what he says on that.
