Windows
Windows 11 runbooks for the home
Operator-grade troubleshooting for Windows as home infrastructure on Windows 11 24H2 and 25H2: won't-boot recovery, BitLocker recovery keys, slow-after-update diagnosis, reaching a NAS over the hardened 24H2 SMB defaults, and the Windows 10 end-of-support decision. Every page is source-backed, pinned to the current build, and written to leave you with a fix — not a list of vague tips.
From recovery to a real backup plan — the operator path
Treat the PC as infrastructure: reach your storage and back it up, know the recovery ladder before you need it, keep it fast, and plan ahead for the Windows 10 cutoff. Each step links a source-backed runbook.
1 · Reach your NAS
Connect storage & back up
Reach a NAS over the hardened 24H2 SMB defaults, then plan a backup target — the home NAS pillar and buying guide.
Reach your NAS2 · Recover
Won't boot, or locked out
Work the won't-boot recovery ladder and find your BitLocker recovery key before it costs you the drive.
Recovery runbook3 · Fix slow & full
Slow, full, or stuck after an update
Diagnose slow after an update and a full C: drive, and decode update error codes.
Performance fixes4 · Plan ahead
Windows 10 end of support
Decide whether to upgrade or replace — and whichever you choose, get a restorable backup to a NAS off the old machine first.
Upgrade or replaceBoot & recovery
When Windows won't start — getting into WinRE, rolling back a bad update, Startup Repair, and fixing the boot files without erasing your data.
Recover a Windows 11 PC that won't start: enter WinRE, roll back a bad update, run Startup Repair, and fix the boot files without erasing your files.
Open runbookSecurity & BitLocker
BitLocker recovery-key prompts after an update or firmware change, where to find your key, and how to stop it recurring.
Why Windows demands a 48-digit BitLocker recovery key after an update or firmware change, where to find the key, and how to stop it recurring.
Open runbookNetworking & shares
Reaching a NAS or shared folder from Windows 11 — the 24H2 SMB hardening (signing required, guest disabled) that breaks consumer NAS — and getting Wi-Fi or internet back after an update broke it.
Windows 11 24H2 hardened SMB: signing is now required and guest access is off by default, breaking many NAS shares. The errors and the right fix.
Open runbookWi-Fi or internet stopped after a Windows 11 update? Classify the failure, work the network-reset ladder, roll back the adapter driver, check release-health.
Open runbookPerformance
A PC that got slow after a 24H2/25H2 update, or is pinned at 100% disk or CPU at idle — separating normal background work from a real regression, naming the process, and only then suspecting hardware.
PC sluggish after a Windows 11 24H2/25H2 update? Separate normal post-update background work from a real regression with Reliability Monitor first.
Open runbookFind the process before blaming hardware: the Task Manager, Resource Monitor, Reliability Monitor ladder for 100% disk or CPU at idle on Windows 11.
Open runbookStorage
Reclaiming a full C: drive after an update — removing Windows.old, shrinking the WinSxS component store the supported way, and using Storage Sense and Disk Cleanup safely.
Reclaim space safely after a Windows 11 update: remove Windows.old, shrink the WinSxS store with DISM, and use Storage Sense and Disk Cleanup.
Open runbookUpdates & errors
Windows Update stuck or failing on 24H2/25H2 — decoding the error codes, the supported reset-and-repair order, and checking the release-health known-issue list to learn whether it's you or the build.
Windows Update frozen at 0% or 100%, or failing on Windows 11 24H2/25H2? The supported fix order: troubleshooter, free space, reset components, DISM and SFC.
Open runbookWhat the common Windows Update error codes mean: 0x80070643, 0x800f0922, 0x80073712, 0x80070003, 0x80070070 and more, mapped to the real cause and the fix.
Open runbookFind out if your Windows 11 problem is a Microsoft-acknowledged known issue: read the release-health list for 24H2/25H2 and find your exact build.
Open runbookDisplays & docks
A second monitor that won't show up, or a USB-C / Thunderbolt dock that won't drive the display — working the cable, port, driver, dock approval, and patch layers in order.
A second monitor not showing up on Windows 11 24H2/25H2? Work the layers: Win+P and Detect, the cable, port and input, then roll back the graphics driver.
Open runbookA USB-C or Thunderbolt dock not driving your monitor on Windows 11? Power-cycle the dock, approve Thunderbolt, check video-capable USB-C and DisplayLink.
Open runbookPrinters
A network printer stuck 'offline' after an update — the real causes (SNMP status polling, a changed IP, a spooler glitch) and the fixes, plus what the 2026 print-driver changes mean.
A network printer stuck offline on Windows 11 after an update? The real causes: SNMP status polling, a changed printer IP, a spooler glitch, and the fixes.
Open runbookUpgrades, lifecycle & eligibility
The Windows 10 end-of-support decision and Windows 11 eligibility — upgrade, replace, extend with ESU, or switch OS, plus what TPM 2.0, Secure Boot, and the CPU requirement really mean and how to enable them.
Windows 10 support ended October 14, 2025. Your options: upgrade to Windows 11, replace the PC, enroll in one year of consumer ESU, or switch OS.
Open runbookWhat "This PC can't run Windows 11" means after Windows 10 end of support: TPM 2.0, Secure Boot, the supported-CPU line, plus enabling the first two in UEFI.
Open runbookWindows: common questions
Why can't Windows 11 see my NAS or network share?
Windows 11 24H2 hardened SMB defaults (SMB signing required, guest access off), which breaks older shares. The network-share runbook covers the exact settings and the safe way to restore access.
Windows won't boot — what's the recovery order?
Work from least to most destructive: Startup Repair, Safe Mode, system restore, then targeted fixes — before anything that risks data. The won't-boot recovery ladder lays out the order and the stop points.
Where do I find my BitLocker recovery key?
Usually in your Microsoft account, an exported file, or AD/Entra — not on the locked machine. The BitLocker recovery-key runbook shows where to look and why an update can suddenly demand it.
Windows 10 is end of support — should I upgrade or replace?
It depends on TPM/CPU eligibility and the machine's life left. The end-of-support decision guide frames it; either way, back the old PC up to a NAS before you migrate.
15 Windows runbooks and growing. New Windows 11 operator pages are added as each theme is built out.