Most of those important errors are the kind that even a power user couldn't detect on their own, so it's good that System Mechanic is there for you to tell you what's up. When I first loaded System Mechanic, I received a diagnosis of how many important problems my computer had, and how many programs that may not need to be loaded at startup there are. Once you're clicking through every single option in the main menu, inside of Toolbox, under "All-in-one Tools" you'll find Total Care, a one-stop function to put System Mechanic to work. A feature that feels paramount, Total Care, in which System Mechanic runs a diagnostic, repair, cleanup, and security check all with one click, is nested a bit too deeply into the system. System Mechanic is separated out into a list of subsections: Dashboard (where you are given your diagnosis), ActiveCare (automated services on call to protect you), LiveBoost (focused on increasing your machine's speed), Internet Security (which detected that Windows Defender was there for me), Toolbox (more on that in a moment), and a section to get Reports about your system's status.