I replaced the hard drive in my Acer Aspire computer, installed Windows 7 using the product key that came with the computer, and have been using it for many years.
Now, it will not successfully upgrade to Windows 10: "Windows 10 couldn't be installed...Error...C1900101-4000D".
After searching the Internet and noticing other people are having the same problem...so I don't waste my time trying to troubleshoot this issue...I decided I would install Windows 7 anew, and after (try to) upgrade (to Windows 10). But first...I need a Windows 7 DVD...
At http://www.microsoft.com/en-us/software-recovery , the Microsoft Software Recovery webpage, it states:
"Thanks for being a Microsoft customer...
"After you verify your product key below, you will download a disc image (ISO file) and use it to create a bootable USB or DVD. This will require ISO burning software such as the Windows 7 USB/DVD Download Tool."
I entered the product key on my computer...
"Unsupported Product...The product key you entered appears to be for software that was pre-installed on a device. Please contact the device manufacturer for software recovery options."
No. I'm done. I have a valid product key, and all I need is a copy of the installation software.
More and more I find reasons NOT to desire and need Microsoft Windows (and other products).
I have a Toshiba Satellite A105 (with 4 GB RAM) that is in great shape...and one of very few distributions of the Linux operating system I have been able to find light enough for it to be useful, is LXLE.
Years ago, because it was all I could afford at the time, I purchased a Chromebook. I liked it, but that particular model was not powerful enough for me: I keep MANY tabs open, and applications running.
After I purchased a HP 2000 notebook that had Windows 8...I increased the RAM to 8 GB. Quickly it began to perform sluggishly. I uninstalled unnecessary software, and use mostly "portable" applications and programs. Using the computer on the Internet is aggravating and annoying. I've tried faster hard drives, and various versions of Linux...I am convinced the processor ("AMD E-300 APU with Radeon HD Graphics / 1300 Mhz / 2 Cores / 2 Logical Processors") is the cheapest they could find for this low-end computer. I believe I paid somewhere near $300 for it at the time.
My latest purchase is an Acer Chromebook 13 with a quad-core processor, 4 GB RAM, and a 32 GB drive. (I've read that sometimes the 16 GB drive isn't large enough to be able to download and watch some videos from the Google Play store.) I love it! Mostly, I have no complaints. Though I do love 15-inch screens. (I've been planning to review the Chromebook, but haven't had time to do so...)
Soon I will install (LXLE) Linux on the HP. Based on my experience with the Toshiba computer, I expect it will satisfy my needs. And I intend to NEVER purchase anything less than a quad-core processor.
I have one other computer with Windows 7 on it...that will not upgrade to Windows 10. It has its original hard drive...so I will restore its operating system, and again attempt to upgrade to Windows 10. But also will plan to need to install Linux...
Which now means I also need to plan to use other products and services that are not produced by Microsoft (like Office).