Diablura :
Hi! Thank you for your recommendation, but it didn't work: I used the disc that someone was nice enough to lend me, but at the final stage (the final installation) the system gave the same message and loop as before. I am going to try a complete reformat: delete everything and start from scratch.
By the way, I am doing this because my laptop started doing long repairs and later unannounced shutdowns after the last Security Windows Updates. I didn't make any modifications to my hardware: I don't even know how to make them. The only other thing I think could have made a damage was the installation/uninstallation of SpeedMyComputer: big mistake.
Thank you again.
Hello again Diablura
Can you please check if you can start Windows in safe mode?
If you can enter into the safe mode, can you please try restoring Windows to an earlier restore point for me? You can get the step-by-step instructions on how to restore your computer from the safe mode from
here.
If you can enter into the safe mode, and the restoring Windows option fails, you can manually uninstall the most recent security update that you installed. Also, from the safe mode itself, you can uninstall the SpeedMyComputer software from the Control Panel.
If every solution described above fails, you can go for the clean system format as the last resort.
Good Luck!!