root@thehacksparrow:~/writeups$ SYSTEM ONLINE
root@sparrow:~/writeups$ cat guia-formatear-windows-11.md
// tools

Reset & Clean-Install Windows 11

22 Jul 2026 · 3 min read

When to use this guide — before selling or giving away a machine, when a Windows install has years of accumulated cruft and runs slow, or when you suspect persistent malware you can't otherwise clean out. "Reset this PC" reinstalls Windows 11 from scratch without needing an installation USB.

SystemWindows 11 / 10 (nearly identical process)
Estimated time30-90 min depending on install type
RequiresInternet connection if you choose cloud download

0. Before anything — back up

Save anything important to a USB drive or the cloud. "Reset this PC" with "Remove everything" deletes files, apps and settings — there's no going back once you confirm.

Steps

#Step
1Press Start → type "Recovery" → open Recovery options
2Click "Reset this PC" → "Reset PC"
3Choose "Remove everything" — a real clean install, not "Keep my files"
4Pick the install type (see table below)
5Under "Change settings", decide whether to properly wipe the disk (see table below)
6Confirm the summary and click "Reset"

Install type: cloud vs local

OptionWhat it doesWhen to choose it
Cloud download (recommended)Downloads the latest Windows 11 build directly from MicrosoftWhenever you have decent bandwidth — guarantees the newest, clean version
Local reinstallUses the files already present on diskFaster, but can carry over remnants if the system was damaged or infected

Data cleanup: quick vs secure

OptionWhat it doesWhen to choose it
❌ Just remove my filesQuick delete — files could still be recovered with forensic softwarePersonal use, you're keeping the machine
✅ Clean the data (recommended)Secure full-disk wipe, much slowerYou're selling, gifting, or disposing of the machine — prevents the next owner recovering your data

From a security standpoint, the difference between these two options is exactly the difference between deleting a file and overwriting it: a quick delete only removes the file's reference in the filesystem, but the data physically remains on disk until something overwrites it — recoverable with standard forensic tools.

After the reset

  • Windows boots with factory settings, no previous apps or files
  • You'll need to reinstall programs and restore your backup
  • Good moment to enable BitLocker, check Windows Update, and remove any preinstalled bloatware