Many computer users are working on old, hand-me-down equipment. This guide outlines how to get more mileage out of a PC through upgrades and/or repairs. It features step-by-step procedures for appraising equipment and determining if an upgrade is worthwhile; 25 top upgrades for under $400; and a troubleshooting quick reference including the top ten boot failures. The book is Web-enhanced to provide online updates and suggestions.