When I try to boot my laptop (Acer) I get black screen with text only:

Windows could not start because the following file is missing or corrupt:
<Windows Root>\system32\ntoskral.exe.
Please re=install a copy of the above file.


I googled ntoskral.exe and read only potential bad news.

What would you do if it were you?
How the heck do I "reinstall a copy of" this file?

Can you hear my huge sigh from where you are? :(