I have the same problem re my ACER computer not starting after the
machine trying to download upgrades, the messages are as follows-
"stage 1 of 3 0% complete", once it tries to download only 2 of the 3
downloads gets to 100% then the machine tries to restart, message then
reads "computer was unable to restart" and start up repair kicks in then
the "stage 1 off 3 0% starts again.
We have tried hitting F8 to restore but it did not work.
After the computer tries to restart in the diagnostics there is a Boot
Critical File - "C:\ntoskrnl.exe (corrupt).
Any ideas how to fix the machine, it has been two days now without