I take great care to purchase best quality components for all the desktop computers that I hand build myself.
Once the computer is built I install the operating system and other software that I offer with the computer including a good security suite.
In addition I configure settings to ensure that the computer is running at peak performance upon delivery to the customer.
Every computer I build goes through stringent bench testing for eight hours prior to delivery to my customers, this helps to ensure the computer has no problems prior to delivery.
Once the computer has passed all tests the computer is delivered and demonstrated to the customer.