Nobody knows everything and there are still many things I don't know about computers and which, maybe, are not so important in my view.
I build up to a hundered of this machines a year for friends and repair and service this horrible things. I have become Doc XP in some way and softs like Windows 2000 or XP have not many secrets left to me.
I use a park of 4 machines for me alone. One shows my satellite TV on a 38 inch screen, the 17 Inch Acer laptop followed me once with my camera on travels, I run a workstation with high power and capacity for my Photo and video works and I have a home build server with 10 hard-drives totaling some 1.2 terrabyte of space used to allmost 90%. So, time to think about expansion.
Computers are like photography, a progressing, but never ending story and a permanent technological challenge.