Christopher NullPCWorld Follow me on Google+

Christopher Null is a veteran technology and business journalist. He contributes regularly to PC World and Wired, and is a technology columnist for Executive Travel magazine.

5-Minute Fixes for Windows PCs

Our experts offer 30 instant solutions to the most common problems affecting Windows 7, Vista, and XP.

Easy Fixes for Networking Problems

Having trouble connecting? Try these two simple approaches to sharing files and troubleshooting your network.

Simple Fixes for a Problematic PC

Need to troubleshoot an error-prone PC? Check out our easy-to-follow tips for dealing with audio problems, bad drivers, and more.


Fast Fixes for Office Annoyances

Frustrated by Office irritations? Follow our quick tips for adjusting settings in Word, Outlook, and more.


Get VIP Treatment When You Buy for Your Small Business

You could be missing out on preferred treatment and better deals when shopping for tech gear for your company. Here are some special deals that seven big retailers offer small businesses.

The 25 Worst High-Tech Habits (and How to Fix Them)

You’re doing a lot of stuff that's messing up your tech hardware--and your personal and professional life along with it. Here’s how to do better.


Save time and irritation by banning splash screens, intro movies, and nag screens.

Work Smarter In Windows: 55 Great Productivity Tricks

Do everything faster with these indispensable productivity tricks--including real-world advice from efficiency experts.


This browser plug-in replaces Gmail's ads with information about your e-mail contacts.


Productivity measure, analysis and benchmark software

Taxi Magic

This app lets you book and track your cab from many mobile phones.


15 Top Transportation Apps for Planes, Trains, and Cars

Hitting the road never felt so good. Can't find a train schedule or a taxi? Want to locate the cheapest gas in town? These 15 mobile applications take the sting out of getting around.

Which Online Mapping Service Is Best?

Bing, Google Maps, and MapQuest all have their charms, but which one will get you where you need to go with the least hesitation and the most accuracy? We examine all three and pick a winner.


Viral Video: A DIY Guide

Want 15 minutes of fame? Try 90 seconds. Here are the essential components of a great viral video, regardless of length.


10 Businesses You Can Start From Your Smartphone

When all else fails, start your own company with little more than a smartphone. Here’s how to launch a shoestring business with virtually nothing.