Hi malikali. I've split your post off from an entry in the 'Windows XP Tips 'n' Tweaks' section for discussion in this Windows XP section. I've also edited out several links to your personal website. Such links are not necessary to the topic, and are disallowed in forum posts here other than in the appropriate sections. After you've made 10 posts or more you'll be able to include a link to your website in your forum sig.
Whilst some of the comments you've made are commonsense tips, I have to worry about some aspects of your approach. Regular PC maintenance needs to include more than just regular defragging. Due attention MUST be paid to regularly cleaning out debris such as temporary files etc etc, and to removing unused programs.
In addition, I very much reject the view that Windows should be installed cleanly every 3 months or so. In my view, that is the approach of someone who does NOT know how to look after their Windows installation, and is taking an 'easy way out'.