Since a few weeks my Windows 10 PC boots super slow (from SSD); minutes instead of seconds. Inspired by this Microsoft TechNet article I investigated the boot sequence with Process Monitor. I noticed that there are several steps that take up to a 1 minute each and they all have result status "CANCELLED". Most of these steps involve loading the profile picture, accessing the desktop, and accessing the Startup Menu. What might be wrong? How can I fix it?