Windows 10 stands as the world's most popular operating system according to statistical data from computer manufacturers. If your computer is running on Windows XP, Vista, 7, or 8.1, it's time to upgrade to Windows 10 by downloading it directly from Microsoft's official website.

1. Download Windows 10 using Microsoft's Media Creation Tool
Step 1: Download and install the Media Creation Tool by visiting the following link: https://www.microsoft.com/en-au/software-download/windows10

Step 2: Once downloaded, open the MediaCreationTool.exe file. Then, check the option for Create installation media (USB flash drive, DVD, or ISO file). Click Next to proceed.

Step 3: Uncheck the option for Use the recommended options for this PC and click Next to continue.

Step 4: Select the ISO file option to download the Windows ISO file to your computer and click Next to proceed to the next step.

Step 5: Choose where to save the file and click Save to save the Windows 10 ISO file.

Step 6: The download process begins, and the speed can vary depending on your Internet connection.

After successfully downloading, open the folder containing the Windows file in ISO format and install via USB. For detailed instructions on installing Windows via USB, refer to the following article: How to Install Windows 10 via USB Step by Step

2. Download Windows 10 directly from Microsoft
Step 1: Visit the following website: https://www.microsoft.com/en-us/software-download/windows10
Then, open the Inspect/Developer Tools window by pressing F12 (for Chrome, Coc Coc browsers) or by using the shortcut Ctrl + Shift + M for Mozilla Firefox. Next, click on the three dots (1) in the Inspect dialog => More Tools (2) => Network Conditions (3).

Step 2: In the Network Conditions section, uncheck the option Select automatically (1) under User agent. Then, select the User agent type as Safari – iPhone iOS 9 (2). Press F5 to refresh the webpage.

Step 3: After switching to a different User agent, the options to download the Windows ISO will appear. Choose the Windows 10 edition according to your preference and click Confirm.

Step 4: Next, select the language for the Windows edition and click Confirm to proceed.

Step 5: Finally, select the Windows edition, either 32-bit or 64-bit, depending on your computer's configuration.

With this simple guide to downloading Windows 10 from Microsoft, you can reinstall Win 10 with confidence, without worrying about viruses or ISO file errors. Wishing you success!
