Quick answer
To install Windows 11, you need a USB drive of at least 8 GB and the Media Creation Tool from Microsoft's website. Back up your data, boot the computer from the USB drive, and follow the installation wizard. The process takes about an hour, and after installation, update the system and drivers.
How to recognize the problem
- Windows does not boot or a blue screen appears on every startup
- The system is so slow that daily work is impossible
- Errors appear that cannot be resolved by system repair
- You want a clean installation without inherited problems and unnecessary programs
Most common causes
Corrupted system files
Viruses, power outages, or failed updates can damage the files needed to boot Windows. Repair is sometimes not possible, so reinstalling is the fastest solution.
Driver or software issues
Incompatible drivers or programs can cause instability. A clean installation removes all such conflicts.
Worn-out or faulty system disk
If the disk has bad sectors, the system can become unstable. Before reinstalling, check the disk health.
Desire for a clean system
After long use, many programs and settings accumulate. Reinstalling returns the system to its initial state.
Step-by-step fix
- 1
Back up your data
First, save all important files to an external drive or cloud. Reinstalling erases everything on the system disk. If the computer is functional, copy documents, photos, and other files manually or using backup tools.
- 2
Download the Media Creation Tool
Go to the official Microsoft Windows 11 download page and download the Media Creation Tool. Run it as administrator. Accept the terms of use.
- 3
Create the installation USB
In the tool, select the option to create installation media (USB flash drive). Insert a USB drive of at least 8 GB (all data on it will be erased). Select the drive and wait for the tool to download Windows and format the USB. The process may take 20-40 minutes.
- 4
Boot the computer from the USB drive
Restart the computer and immediately press the key for selecting the boot device (usually
F12,F11,Esc, orF8, depending on the manufacturer). In the menu, select the USB drive. If the menu does not appear, enter BIOS/UEFI and change the boot order. - 5
Start the installation
When the Windows installation appears, select the language and keyboard layout. Click Install now. If it asks for a key, click I don't have a product key (activation can be done later). Accept the license terms.
- 6
Choose the installation type
Select Custom: Install Windows only (advanced). For a clean installation, delete all partitions on the system disk (but not on other disks) and select the unallocated space; this erases all data, so make sure you have a backup. Click Next to start the installation.
- 7
Wait and set up Windows
The installation takes 15-30 minutes, and the computer restarts several times. Then set up the region, keyboard, network, and user account. If needed, connect to a Microsoft account.
- 8
Install updates and drivers
Go to
Settings > Windows Updateand click Check for updates. Install all available updates. Then install drivers for the chipset, graphics card, and network from the computer manufacturer's website. - 9
Restore data and programs
Restore file backups and install the programs you use. It is also recommended to install antivirus software and scan the system.
If the installation fails
If the installation stalls or an error appears, check that the USB drive is functional and that the tool created the media without errors. In UEFI, check that TPM 2.0 and Secure Boot are enabled, as they are required for Windows 11. Do not disable Secure Boot without reason. If Windows does not see the disk, check that the SATA controller is in AHCI mode; make this change before installation and with a backup. If the error repeats, the problem may be hardware (RAM, disk). In that case, seek service help. For business computers, before reinstalling, be sure to create a system image so you can restore the previous state if something goes wrong.
How to prevent it
- Regularly back up important data to an external drive or cloud
- Install only trusted programs and regularly update Windows
- Check disk health using manufacturer tools
- Use a quality USB drive from a known manufacturer for the installation media
When to call a professional
If you are unsure how to back up or are afraid of data loss, contact an IT expert. Also, if the reinstallation fails or hardware errors appear, it is better to have a service handle it.
IT infrastructure maintenance · Servers, networks, backup, security and helpdeskFAQ
Can I reinstall Windows 11 without deleting data?
If you start the installation from existing Windows and choose the option to keep personal files, data may remain, but this is not a clean installation and does not solve all problems. For a clean installation from a USB drive, the partition is deleted or formatted, so restore data from a backup.
How long does it take to create the installation USB?
Depending on internet speed and the USB drive, the process takes between 20 and 40 minutes. The download of Windows 11 itself may take longer if the connection is slow.
Is a product key required for Windows 11?
If the computer previously had an activated Windows 10 or 11, the digital license is linked to the hardware and activation will occur automatically after installation. Otherwise, a key is required.