Home PC Support Guides - Information for Windows XP/Vista/7/8/10

This is an optimisation resource for XP, Vista, Windows 7, 8 and 10 (formerly called XPFree).
About me: I program, have a BSc in Comp Sci & troubleshoot computers as a job. I have some idea of what I'm doing.
I live in New Zealand which as you may know, is somewhere near the penguins.