It worked for a day, and then the screen suddenly went black. After restarting, it tried to install an update, failed to do so and "rolled back changes". Now I can only see a mouse pointer with black screen, can't boot to desktop. The only thing I did is turn on Windows Update service to install a language pack. Did I have to turn it off afterwards? But I don't think that was the problem, as my laptop worked until the next day just fine even after restarting a few times.
Do you guys know what's the issue? I'll try reformatting, but I hope it doesn't happen again.