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Installing Windows Updates

Installing Windows Updates

Windows Updates deliver security patches, bug fixes, feature improvements, and driver updates from Microsoft. Keeping systems up to date is a foundational part of maintaining a secure and stable Windows environment. Updates can be applied through the Settings UI, Windows Update for Business (WUfB), Windows Server Update Services (WSUS), or via command-line tools such as PowerShell and wuauclt.

Background

Microsoft releases updates on a regular cadence, most notably on Patch Tuesday (the second Tuesday of each month). Update types include:

Update Type Description
Security Updates Patches for CVEs and security vulnerabilities
Cumulative Updates Bundled fixes rolled up into a single package
Feature Updates Major OS version upgrades (e.g. 22H2 → 23H2)
Driver Updates Hardware driver updates via Windows Update
Definition Updates Antivirus/antimalware signature updates
Optional Updates Non-critical updates requiring manual selection

In enterprise environments, updates are typically managed centrally via WSUS, Microsoft Endpoint Configuration Manager (MECM/SCCM), or Windows Update for Business policies through Intune or Group Policy.

Usage

Via Settings UI (Windows 10/11)

  1. Open Settings → Windows Update (or Update & Security → Windows Update on Windows 10)
  2. Click Check for updates
  3. Allow available updates to download and install
  4. Reboot when prompted if required

Windows Update settings screen showing available updates Screenshot: Windows Update page in Settings showing pending updates and their status

Via PowerShell (PSWindowsUpdate Module)

The PSWindowsUpdate module is the most practical PowerShell method for managing updates on individual machines or via remoting.

Install the module (run as Administrator):

Install-Module -Name PSWindowsUpdate -Force -Scope AllUsers
Import-Module PSWindowsUpdate

Check for available updates:

Get-WindowsUpdate

Install all available updates:

Install-WindowsUpdate -AcceptAll -AutoReboot

Install updates without auto-reboot:

Install-WindowsUpdate -AcceptAll -IgnoreReboot

Install only security updates:

Install-WindowsUpdate -Category "Security Updates" -AcceptAll -AutoReboot

Install updates on a remote machine:

Invoke-WUJob -ComputerName SERVER01 -Script {
    Import-Module PSWindowsUpdate
    Install-WindowsUpdate -AcceptAll -AutoReboot
} -RunNow -Confirm:$false

Via Windows Update Agent (wuauclt / UsoClient)

Note: wuauclt is deprecated on Windows 10 1903+ in favour of UsoClient.

Trigger an update scan (legacy):

wuauclt /detectnow

Trigger an update scan (modern):

UsoClient ScanInstallWait

Force start an update install:

UsoClient StartInstall

Restart to complete pending updates:

UsoClient RestartDevice

Via Windows Server Update Services (WSUS)

In a domain environment where clients are pointed at a WSUS server, approve updates in the WSUS console and allow clients to pick them up on their sync schedule, or force a manual sync.

Force client to sync with WSUS immediately:

# Check current WSUS configuration on client
Get-ItemProperty "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU"

# Force detection and download
wuauclt /reportnow
UsoClient RefreshSettings
UsoClient ScanInstallWait

Check WSUS server assignment via registry:

Get-ItemProperty "HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate" |
    Select-Object WUServer, WUStatusServer

Via Windows Update for Business (Group Policy / Intune)

Configuration is typically managed at a policy level rather than per-device commands. Key Group Policy paths:

Setting GPO Path
Configure update source Computer Config > Admin Templates > Windows Components > Windows Update
Defer feature updates Windows Update for Business > Select when Feature Updates are received
Defer quality updates Windows Update for Business > Select when Quality Updates are received
Pause updates Windows Update for Business > Pause Feature/Quality Updates

Apply Group Policy changes immediately with:

gpupdate /force

Common Use Cases

Check Installed Update History

Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 20

Check if a Specific KB is Installed

Get-HotFix -Id KB5034441

List Pending Reboot Status

# Check if a reboot is pending after updates
$rebootPending = @{
    WindowsUpdate   = Test-Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired"
    ComponentBased  = Test-Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending"
    PendingFileOps  = (Get-ItemProperty "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager" -Name PendingFileRenameOperations -ErrorAction SilentlyContinue) -ne $null
}
$rebootPending

Hide a Specific Update (PSWindowsUpdate)

Hide-WindowsUpdate -KBArticleID KB5034441 -Confirm:$false

Batch Update Multiple Remote Servers

$servers = @("SERVER01", "SERVER02", "SERVER03")

Invoke-WUJob -ComputerName $servers -Script {
    Import-Module PSWindowsUpdate
    Install-WindowsUpdate -AcceptAll -AutoReboot | Out-File "C:\Logs\WULog_$(hostname).txt"
} -RunNow -Confirm:$false

Update Process Flow

flowchart TD
    A([Start]) --> B[Check for Updates]
    B --> C{Updates Available?}
    C -- No --> D([System Up to Date])
    C -- Yes --> E[Download Updates]
    E --> F[Install Updates]
    F --> G{Reboot Required?}
    G -- No --> H([Installation Complete])
    G -- Yes --> I{Schedule Reboot?}
    I -- Immediate --> J[Reboot Now]
    I -- Deferred --> K[Schedule Maintenance Window]
    K --> J
    J --> L[Post-Reboot Verification]
    L --> B

Verify Update Installation After Reboot

# Confirm a specific KB installed successfully post-reboot
$kb = "KB5034441"
$result = Get-HotFix -Id $kb -ErrorAction SilentlyContinue
if ($result) {
    Write-Output "$kb is installed. Installed on: $($result.InstalledOn)"
} else {
    Write-Warning "$kb was NOT found. Update may have failed."
}

Windows Update history showing recently installed updates Screenshot: Update history page confirming successful installation with dates and KB numbers

References

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