recently I downloaded Tweaking free as a trial
in Safe Mode, thought i'd start  1  repair item at a time & took the lower left hand side ( can't tell as the computer is blank)
Tweaking ran  & then asked for a Restart -- ok
on start, stopped immediately  & I found it was missing 
sys32/winload.efi
drivers/ACPI.sys
can't get a Restart at all 
how to fix it -- introduce both above ?  how?
any advice appreciated