In January, I upgraded my Dell Windows 7 laptop to the “assistive technologies” version of Windows 10, which is designed for people with disabilities. After five days, I decided that I preferred Windows 7 and tried to revert to it. However, Windows 7 failed to start and I got the message: “A required device isn’t connected or can’t be accessed; Status: 0xc000000f.” It also said I could insert the Windows 7 installation disk to proceed.

But I don’t have a Windows 7 disk. I didn’t get one with the PC, I never made one and Dell says my five-year-old PC no longer qualifies to download a copy of Windows 7. Can I make a Windows 7 backup disk on my desktop PC that I can use on the laptop? — Larry Salzman, Minneapolis

Steve Alexander covers technology for the Minneapolis Star Tribune. Readers may write to him at Tech Q&A, 425 Portland Ave. S., Minneapolis, Minn. 55488-0002; email: steve.j.alexander@gmail.com. Please include a full name, city and phone number.

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