How to Reinstall Windows | Keep Files Or Start Fresh

Reinstall Windows with Windows Update to keep apps and files, Reset this PC for a deeper refresh, or installation media for a full wipe.

A reinstall can repair damaged system files without forcing a full wipe, but choosing the wrong option can erase apps or personal data. For anyone figuring out how to reinstall Windows, the deciding point is what must survive: apps, personal files, or nothing.

Windows 11 offers several reinstall levels, from a repair that preserves nearly everything to a USB installation that erases the system drive. Windows 10 support ended on October 14, 2025, so reinstalling Windows 10 does not restore Microsoft’s free security fixes.

Which Reinstall Method Should You Use?

The method should match the condition of the PC and the data you want to keep. Start with the least destructive option that can fix the problem, then move to Reset this PC or installation media only when you need a deeper reinstall.

• Windows 11 starts and apps must stay: use Settings > System > Recovery > Fix problems using Windows Update.
• Apps can be reinstalled but personal files must stay: use Reset PC > Keep my files.
• Windows Update repair is missing: run Windows Setup from installation media and keep personal files and apps.
• Windows will not start or the system disk should be erased: boot from installation media.

Copy irreplaceable files somewhere outside the PC before any reset that can remove data. An encrypted PC may also ask for its 48-digit BitLocker recovery key during recovery.

Reinstall Windows Without Wiping Your Apps

Windows 11 can reinstall its current version through Windows Update while preserving apps, personal files, and settings. Microsoft documents this option for system-file and Windows Update problems, and the PC needs power plus an internet connection while it runs.

1. Open Start > Settings > System > Recovery.
2. Under Fix problems using Windows Update, select Reinstall now.
3. Choose whether Windows may restart the PC automatically 15 minutes after installation finishes.
4. Select OK. Windows downloads and installs a repair version of the last operating-system update that installed successfully.
5. Restart the PC if you did not allow the automatic restart.

Your desktop, apps, files, and settings should still be present afterward. If Fix problems using Windows Update is missing, use Reset this PC or installation media; Microsoft says managed PCs may not offer this option.

Reset Windows And Keep Personal Files

Reset this PC reinstalls Windows and can preserve documents, photos, and other personal files while removing installed apps and changed settings. Choose Cloud download for fresh installation files from Microsoft, or Local reinstall to reuse files already on the PC.

1. Open Settings > System > Recovery.
2. Under Recovery options, select Reset PC.
3. Select Keep my files to retain personal files, or Remove everything for a wipe.
4. Select Cloud download or Local reinstall, then follow the confirmation screens.

The reset is finished when Windows returns to setup or the desktop. Microsoft warns that the display can stay black for more than 15 minutes during a reset, so do not force a restart just because the screen looks idle.

On Windows 10, the reset path is Start > Settings > Update & Security > Recovery, then Get started. Microsoft ended Windows 10 support on October 14, 2025.

Use Installation Media For A Repair Or Full Install

Windows installation media can repair a running PC without deleting apps, or erase the system drive and install Windows from scratch. Microsoft requires a blank USB flash drive with at least 8 GB for standard installation media, and the Windows edition you install must match the device’s license.

In-Place Install From A Running PC

An in-place install is useful when Windows still boots and you need to preserve installed programs. Windows Setup gives you three choices under Change what to keep, so confirm that screen before installation begins.

1. Create Windows installation media, connect it to the PC, then open the drive in File Explorer.
2. Open setup.exe from the root of the drive and select Yes if User Account Control asks for permission.
3. Select Change what to keep.
4. Choose Keep personal files and apps, Keep personal files only, or Keep nothing, then select Next.
5. Select Install. The PC restarts several times.

If you chose Keep personal files and apps, your apps and files should be present when the desktop returns. Microsoft’s installation-media reinstall instructions document the current keep-options and full-install screens.

Clean Install From USB

A clean USB install removes personal files, apps, settings, and manufacturer customizations from the Windows system disk. Use this method when Windows cannot start, the existing installation is badly damaged, or you deliberately want an erased system drive.

1. On a working PC, use Microsoft’s Media Creation Tool to make a bootable Windows 11 USB drive. The current tool creates x64 media; Microsoft’s Windows 11 download page offers a separate Arm64 ISO for Arm-based PCs.
2. Boot the target PC from the USB drive. If Setup does not appear, use the PC maker’s boot menu or UEFI boot order to select the USB.
3. Choose language settings, select Next, choose keyboard settings, then select Next.
4. Select Install Windows 11, confirm I agree everything will be deleted including files, apps, and settings, then select Next.
5. If Setup asks for a product key on a PC with a digital license, select I don’t have a product key and choose the same Windows edition the PC was licensed for.
6. Accept the license terms. On Select location to install Windows 11, delete only the partitions on Disk 0 until Disk 0 Unallocated Space remains; do not delete partitions on another disk.
7. Select Disk 0 Unallocated Space > Next, then select Install on Ready to install.

Windows restarts several times and then opens its setup screens. Once the desktop appears, open Settings > System > Activation to confirm the matching edition activated.

What Should You Check Before A Full Wipe?

A full wipe leaves little room for a missed backup or a mistaken disk choice. Confirm the license, encryption recovery information, USB, and target disk before Setup reaches partition deletion.

A motherboard replacement can also stop automatic activation because Windows may treat it as a major hardware change. On PCs with several internal drives, identify the Windows disk before booting the installer rather than relying on a disk number from memory.

Use The Least Destructive Reinstall That Solves The Problem

The final choice comes down to what must survive the reinstall. Begin with the option that keeps the most data, step up only when the problem remains, and reserve partition deletion for cases where an erased system disk is the goal.

1. Windows 11 boots and apps must stay: run Fix problems using Windows Update > Reinstall now.
2. Personal files must stay, but apps can go: run Reset PC > Keep my files; choose Cloud download when local system files may be damaged.
3. Apps must stay and Windows Update repair is unavailable: run setup.exe from installation media and select Keep personal files and apps.
4. Windows cannot start or the system disk should be erased: boot from USB and perform the full install on the intended Windows disk.
5. After Windows returns: confirm activation, run Windows Update, reinstall removed apps, and restore any files kept outside the PC.

A finished reinstall should leave Windows booting normally, the correct edition activated, and the expected files or apps present for the method you selected. If activation fails after a motherboard change, use the activation troubleshooter or the product key tied to that Windows license.

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