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.

How To Roll Back a Bad Driver

Update your machine's driver in 4 minutes or less to keep your system current on bug fixes and support for new features.

How To Diagnose a PC That Won't Turn On

Determine why your PC won't boot in about 5 minutes.

How To Stop AutoPlay From Bugging You

Disable the annoying Windows AutoPlay in about 2 minutes.

How To Uninstall an Application

Cleaning every last trace of an old program can be a pain. Here's how to do it quickly.

How To Bypass Windows Login

Here's how to turn off the Windows login screen if you don't need the extra privacy protection.

How to Work Outdoors

Working outside is often an eye-squinting, headache-inducing, battery-draining agony. It doesn’t have to be, if you follow these outdoor computing tips.

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How To Boot From a Windows DVD or Another Optical Disc

Boot the PC from the optical drive instead of the hard drive to reinstall Windows or access repair tools loaded on your Windows DVD.

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How To Turn Off Automatic Reboots in Windows

Here's how to change automatic reboots in Windows Update from automatic to manual.

How To Open an Application in XP Mode

A few very old applications won't run under Windows 7--but you can tweak Windows 7 with a few simple clicks.

Quick Windows Fixes

Is Windows malfunctioning, sluggish, or in need of some tweaking? These simple solutions will help you get the OS back into shape.

How To Fix Up Windows XP

Here are some Windows XP tips to keep things running smoothly.

How To Remove AutoCorrect Entries in Office

If you dislike the automatic "corrections" that Microsoft Office performs by default, follow these steps to disable them.

Put Your Tablet to Work

Tablets aren't just for playing Angry Birds. With a little foresight and judicious app installation, you can turn a tablet into a productivity powerhouse.

How To Update the 'Normal' Style in Microsoft Word

Here's how to customize your own default font and paragraph style in Microsoft Word.

How To Share a File With Another Computer at Home

Here's how to set up file sharing and fix connection problems in no time at all.