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.

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.

How To Troubleshoot Network Outages

Numerous circumstances can cause your network to go dark. Follow these steps to fix it.

How to Cut Small-Business Operating Costs

Running a business doesn’t have to mean giving the world free access to your wallet. Here are seven ways you can start saving money for your small business today.

How to Start a Business for Free

You don’t have to spend a fortune to get your startup up and running. Here’s a handy guide to doing business for the absolute minimum in expense.

Seriously, Mom, It’s Not Always a Virus

Contrary to what inexperienced users may think, sluggish performance ≠ malware infection.

Software Speed Boosts for Your PC

Here are 14 software tips and tweaks for turbocharging your computer from startup to shutdown.

Hardware Speed Boosts for Your PC

Which hardware upgrades do the most cost-effective job of turbocharging your PC? We ran tests on various combinations of upgrades to find out.

Networking Speed Boosts

We explain four ways to increase the performance of everything attached to your work or home network.

How Do You Know When Your PC Is Too Slow?

Benchmark testing lets you compare your system's performance to that of other PCs on the same set of tasks.

New Year's Tech Resolutions for Small Businesses

Technology isn’t going to stop moving forward. It’s time to take stock of where your company’s tech is taking you--and of how to prepare for tomorrow.