windows 7 Archives

Fix a Windows boot loop with AHCI

Dave Farquhar Windows January 31, 2017August 11, 2017command prompt, NCQ, PE, UEFI, Windows 10, windows 7

My wife’s computer was stuck in a Windows boot loop. We’d get the Windows 7 boot screen, and it would display a single pixel of the Windows 7 logo, then reboot itself endlessly. Booting in safe mode made it fail on classpnp.sys.

Any number of things can cause this, and it usually happens after you swap a motherboard. Enabling AHCI turned out to be the fix. Enabling AHCI also can be easier said than done, but I figured it out. She’s running Windows 7 (for now) but these same tricks should also work for Windows 10.

Dave Farquhar

David Farquhar is a computer security professional, entrepreneur, and author. He started his career as a part-time computer technician in 1994, worked his way up to system administrator by 1997, and has specialized in vulnerability management since 2013. He invests in real estate on the side and his hobbies include O gauge trains, baseball cards, and retro computers and video games. A University of Missouri graduate, he holds CISSP and Security+ certifications. He lives in St. Louis with his family.

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How to clean viruses off your computer for free

Dave Farquhar security December 14, 2016March 13, 2021antivirus, bitdefender, compaq, computer security, hp, malwarebytes, thumb drive, toshiba, Windows 10, windows 7

Whether you’ve gotten a tech support scam phone call or not, it can be helpful to know how to clean viruses off your computer for free. And yes, I do mean free.

A lot of people get ripped off due to virus scares and it makes me mad. I’m a computer security professional. I advise large companies on computer security for a living. Today I’ll take a few minutes to advise you.

Dave Farquhar

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Fix a Device Manager Code 43 error

Dave Farquhar Windows December 7, 2016December 3, 2016windows 7

Sometimes computer peripherals stop working in Windows, and you’ll start to troubleshoot and find a code 43 error. Here’s how to fix a Device Manager Code 43 error without compromising on security.

There’s a lot of bad advice out there on code 43 errors since it’s not very well documented. I started my career as a computer technician and now I work in security, so this is a comfortable topic for me. I want your computer to work, but I also want it to be secure.

Dave Farquhar

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Fix a Fujitsu Scansnap Code 43 error

Dave Farquhar Hardware September 30, 2016September 29, 2016power button, usb port, Windows 10, windows 7

When you connect a Fujitsu Scansnap scanner to a Windows machine over USB, it usually works fine–until the dreaded Error Code 43 error turns up. Here’s how to fix a Fujitsu Scansnap Code 43 error under Windows 7 or Windows 10.

Dave Farquhar

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Check your network speed in Windows 10

Dave Farquhar Servers and Networking, Windows September 15, 2016April 3, 2018cat5e, command prompt, network cables, Task Manager, wi-fi, Windows 10, windows 7

Sometimes you need to check your network speed in Windows 10. The information buried a bit but you can get there in about three clicks. When you need to know the raw specs of your network connection, here’s how to do it. Microsoft seems to have moved this recently, sometime in 2018, so I’ve updated this for the current builds of Windows 10.

Depending on your network driver, it was sometimes easier to get this in previous versions of Windows. Sometimes all you had to do was hover over your network connection icon. But this method also works in Windows 7, even if you have a featureless network driver.

Dave Farquhar

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Best free antivirus

Dave Farquhar security September 9, 2016November 21, 20181990s, antivirus, AV, malware, Microsoft Security Essentials, Task Manager, Windows 10, windows 7

What’s the best free antivirus? I have an answer that may surprise you. I also have a supplement that may surprise you. And I have a third supplement you already have but probably never heard of.

Keep something in mind. I don’t like using words like “good” and “best” in the same sentence as antivirus software. Imagine a college graduating class whose valedictorian is Chris Farley’s character from the movie Tommy Boy. What you want from your antivirus software is something that doesn’t do a lot of damage.

Dave Farquhar

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System restore from command prompt

Dave Farquhar Windows August 26, 2016November 19, 2016cmd, command prompt, Task Manager, Windows 10, windows 7

Sometimes a Windows computer is so broken that you have to run system restore from the command prompt. If you’re reading this, I don’t have to elaborate. This works in Windows 7, Windows 10, and any other recent version.

And when a system is that broken, you can expect to run into a couple of snags. Maybe you can’t even get a command prompt. Or maybe you got a command prompt but the executable file is buried. Here’s how to solve those two problems. Read more

Dave Farquhar

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Can’t connect to this network? Here’s the fix.

Dave Farquhar Windows July 6, 2016November 26, 2018dell, hp, intel, lenovo, optimizing windows, vista, Windows 10, windows 7

After upgrading to Windows 10, when I unhibernated my laptop the next morning, my wifi connection didn’t work. The connection dropped and I couldn’t reconnect. Forgetting the network and reconnecting didn’t help. Any time I tried to reconnect to my wireless network, I’d get the message that Windows 10 can’t connect to this network.

The problem seemed to be in the power management.

Dave Farquhar

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0xc1900201 error installing Windows 10

Dave Farquhar Windows July 5, 2016September 14, 2018dell, Windows 10, windows 7, Windows XP

Are you getting a 0xc1900201 error installing Windows 10? I got both that and 0xc1900200. Here’s how I fixed it.

I upgraded my venerable Dell E1505 to Windows 10 over the weekend. It was harder than it needed to be, but I got it running. It’s an old machine, but for some tasks, it can handle Windows 10.

Here’s how I got the Windows 10 install working.

Dave Farquhar

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Catch up on Microsoft patching fast

Dave Farquhar security May 23, 2016April 24, 2017vulnerability, windows 7

Last week, Microsoft quietly released its convenience update pack for Windows 7, 8.1., and Server 2008R2. This is a great opportunity to catch up on Microsoft patching, as it incorporates all of Microsoft’s OS-level updates from the release of Service Pack 1 to April 2016.

Here’s how to use this to clear your corporation’s backlog of Microsoft patches. No, I haven’t seen your corporate network, but I’ll bet you have one.

Dave Farquhar

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