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 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.

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.

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.

Networking Speed Boosts

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

Software Speed Boosts for Your PC

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

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.

Trend Micro Titanium Internet Security 2011

As a suite that provides good protection and doesn't require you to fiddle with settings, Trend Micro Titanium Internet Security is worth a look.

Panda Internet Security 2011

Panda Internet Security is generally effective at protection, though its blocking of new malware wasn’t top notch and it slows Windows more than we’d like.

Webroot Internet Security Essentials 2011

Webroot Internet Security Essentials 2011 has plenty of extras, but falls short at keeping your PC safe.

Symantec Norton Internet Security 2011

Norton Internset Security 2011 does an excellent job at blocking and cleaning up malware, and is nicely designed.

Comodo Internet Security Complete 2011

Though it has features like a sandbox system, absent a solid level of core security, it's hard to recommend Comodo.

Avira AntiVir Premium Security Suite

Avira AntiVir is very good at blocking known malware, but it left behind more malware remnants than most suites.