Making your Windows OS more secure & improving privacy online is an awkward enough process given the sheer number of things that can be done to improve it. This guide will cover many such tips for various applications & such, which should make the system that bit more secure as well less prone to viruses.
The guide is mostly aimed at Windows 2000/XP users, though much applies to earlier versions also in addition to other sections covered such as Internet Explorer/Outlook Express, ICQ IM client and general firewall tips, etc.