Five surefire ways to maximize your laptop's battery life

You adore your laptop. It lets you get down to business wherever you happen to be—airport lounge, coffee shop, your home office. It’s the key to your competitive edge.

That is, until its battery croaks. Just as you’re putting the final details on your PowerPoint presentation. At the airport. Two hours before takeoff. And with no power outlet in sight. At that instant, you begin to wonder why you ever bought the ever-lovin’ boat anchor in the first place.

But love will bloom anew as soon as you recharge. Avoid the heartache, however temporary: Follow these five tips for maximizing your laptop’s run time.

Never miss an opportunity to plug your laptop into an AC outlet to top off its battery.

Add a Wi-Fi hotspot to Windows 8 with Virtual Router Plus

Recently I spent a full week in a hotel, where I grudgingly paid for Wi-Fi so I could get some work done. Unfortunately, it was a per-device purchase: Only my laptop could get online. If I wanted Internet access on my phone (which had a weak indoor signal) and tablet (Wi-Fi only), I'd have to pay again. And again.

Hey, wait a minute, doesn't Windows let you set up a Wi-Fi hotspot to share its connection with other devices? It did, in Windows 7; it doesn't in Windows 8. Actually, the capability is still there, but enabling it requires some serious command-line tinkering.

Fortunately, I found Virtual Router Plus, a free utility that adds Wi-Fi hotspot capabilities to Windows 8. It works, but with a few important caveats.

First, be really careful during setup. The price of "free" here is that the installer comes packed with junkware. It's easy enough to bypass if you pay attention, but potentially troublesome if you don't.

On the first screen, choose Custom Installation, then uncheck the box below it. When you click Next, a pop-up will appear; click Cancel. Click Next again, then clear yet another checkbox. Now you're good to go with a clean install. Oy.

When you run the program, it'll pop open a help page in your browser, which you may need to verify whether you have the required device drivers. But skip that for now; instead, try using the utility.

To do so, give your network a name (i.e. SSID), then enter a password (to keep freeloaders out). Finally, choose the connection you want to share (which is probably whatever appears as the default). Now click Start Virtual Router Plus.

After a few moments, you should be able to detect your new network from your phone, tablet, or even another PC. But don't worry: your laptop will retain its own Internet connectivity at the same time.

As I noted before, the utility worked as advertised, but it did create one problem: I could no longer connect to the various virtual private networks (VPNs) I use. Your mileage may vary, and if you don't work with VPNs, you're golden. As for me, I unfortunately had no choice but to uninstall the utility to regain access.

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Regain your PC's administrator rights, even if you don't have the password

Your Windows PC has at least one administrator-level account. If you can't access that account, you've got a problem--you can't install or uninstall programs, or change certain settings.

I'll tell you a way to gain this access,  but first, ask yourself if you really should be doing this. If it's unquestionably your computer and you've forgotten your password (or if the previous owner failed to give it to you), you have every right acquire or change the password. But if it's a company computer and the IT department wants to keep full administrator control to itself, this is a good way to get fired. And if it's someone else's computer, it's a good way to get arrested.

When malware strikes: How to clean an infected PC

You work hard to protect your PC from the malicious thugs of our digital world. You keep your antivirus program up to date. You avoid questionable Web sites. You don’t open suspicious email attachments. You keep Java, Flash, and Adobe Reader up-to-date—or better yet, you learn to live without them.

But against all odds, a clever new Trojan horse slipped through the cracks, and now you’re the unhappy owner of an infected PC. Or perhaps a less-vigilant friend has begged you to clean up a plague-ridden mess.

Obviously, you need to scan the computer and remove the malware. Here’s a methodical approach that you can use to determine what the problem is, how to scan, and what to do afterward to protect the PC from future invasions.