June 2025 Windows 11 Update — Multiple Errors Occurring on Some Devices: Full Troubleshooting Guide

Introduction

The June 2025 Windows 11 updates have triggered a wave of unexpected errors for many users. While most updates install smoothly, a growing number of reports indicate that some users are facing system instability, app crashes, update failures, or even complete system freezes after applying the latest updates.

If you’ve experienced:

• Apps crashing at launch
• Windows Update failing repeatedly
• Blue Screen of Death (BSOD) errors
• Severe system slowness
• Unexplained performance drops

…you’re not alone. This guide will explain what’s happening, why it’s affecting some users, and provide clear, step-by-step solutions that anyone can follow—even if you’re not tech-savvy.

What Updates Are Involved?

Several updates were rolled out in June 2025, including:

• KB5039302 (Preview Update)
• Monthly cumulative security updates
• Enhancements for Windows Copilot, Start Menu, Explorer
• USB and Bluetooth compatibility improvements
• Kernel-level security reinforcements

While these updates bring useful improvements, they have inadvertently triggered conflicts on some devices due to hardware variations, driver differences, and specific system configurations.

Common Problems Being Reported

Here’s a quick summary of the main issues many users are encountering:

👉 Many users have described situations where their CPU usage is only 5–20%, yet the entire system feels unresponsive. This suggests deeper issues such as storage I/O delays, process conflicts, or hidden background tasks.

Devices and Configurations Most Affected

While not every user experiences these problems, certain devices appear more prone to issues:
• Manufacturers involved in multiple reports:
Fujitsu, NEC, Dell, GIGABYTE, ASRock
• Custom-built desktop PCs (especially with newer chipsets)
• Intel 12th Gen and newer processors
• Systems with overclocked CPUs or enabled XMP profiles
• Old drivers that haven’t been updated
• Heavy use of external USB or Bluetooth devices

👉 These patterns don’t mean the manufacturers are at fault. Instead, specific hardware and driver combinations seem to conflict with some aspects of the June updates.

Why Are These Issues Happening?

The root causes appear to involve several technical factors:
• Driver compatibility conflicts with new kernel security changes
• Storage I/O (read/write access) delays
• Background tasks overwhelming system resources
• Windows Defender aggressively scanning after updates
• Memory leaks in certain applications
• BIOS settings conflicting with new update features

Solution 1 — Repair System Files

System files can become corrupted during major updates. Windows includes built-in repair tools that can safely fix these issues.

How to do it:

1. Open Command Prompt as Administrator.
• Right-click the Start menu and choose “Command Prompt (Admin)” or “Windows Terminal (Admin).”
2. Run the following command to check and repair system files:

3. Once that completes, run this command to check for deeper system component corruption:

👉 Even small corruption can cause strange performance problems after updates. Running these tools can resolve many underlying issues quickly.

Solution 2 — Update or Roll Back Drivers

Outdated or incompatible drivers are one of the most common causes of these update-related problems.

Focus on updating:

• Storage controllers (NVMe/AHCI drivers)
• Chipset drivers (Intel/AMD motherboard chipset)
• Graphics drivers (NVIDIA, AMD, Intel)
• USB controllers and Bluetooth drivers
• LAN / Wi-Fi drivers

Important Tip:

• If the issue started right after a recent driver update, rolling back to the previous driver version may help.
• Don’t assume that the latest drivers are always the safest—sometimes an older stable version works better temporarily.

Solution 3 — Check Memory Health (RAM)

Faulty or unstable RAM can trigger update failures, random crashes, or unexplained slowness.

How to test your memory:

1. Press Windows key, search for “Windows Memory Diagnostic.”
2. Select “Restart now and check for problems.”
3. Let your PC restart and automatically run the memory scan.
4. If errors are found, faulty RAM may need replacement.

Solution 4 — Review Startup Apps & Background Processes

Many performance issues after updates are caused by background apps running silently.

Steps to review:

1. Press Ctrl + Shift + Esc to open Task Manager.
2. Click on the Startup tab.
3. Disable unnecessary apps from starting with Windows.
4. Check cloud sync services (OneDrive, Dropbox, Google Drive) — they may be heavily syncing after updates.
5. Temporarily pause or disable heavy synchronization tasks.

👉 After major updates, Windows sometimes re-enables apps that were previously disabled, increasing background load.

Solution 5 — Review Windows Defender Activity

Windows Defender can sometimes aggressively rescan all files after updates, especially if system files were changed.

Check for Defender activity:

1. Open Windows Security → Virus & Threat Protection.
2. Review the Protection History to see if full scans have recently occurred.
3. If necessary, adjust scheduled scan times to avoid conflicts during work hours.

👉 Disabling Defender entirely is not recommended, but adjusting its behavior can reduce unexpected background load.

Additional Workarounds & Expert Tips

Safe Mode Update Install

If Windows Update keeps failing:

• Boot into Safe Mode (Start → Settings → System → Recovery → Advanced Startup → Restart Now).
• Try applying updates while in Safe Mode, where fewer drivers may conflict.

Manual KB Installation via Microsoft Update Catalog

If automatic updates keep failing:

• Visit the Microsoft Update Catalog website.
• Download the standalone KB package (e.g., KB5039302).
• Manually install it by double-clicking the downloaded file.

This often bypasses background conflicts that block automatic installation.

Check Windows Update Logs

Advanced users (or IT support) can review Windows logs for deeper insights:

• C:\Windows\Logs\CBS\CBS.log
• C:\Windows\WindowsUpdate.log

Even if you don’t fully understand these logs, sharing them with support can help pinpoint underlying errors.

Use LatencyMon to Diagnose I/O Delays

Download LatencyMon (free tool) to analyze DPC latency and storage I/O delays that may explain poor performance despite low CPU usage.

Verify BIOS Settings & Updates

BIOS configurations can conflict with newer update processes:

• Disable overclocking or high-performance memory profiles (XMP).
• Check for the latest BIOS update on your manufacturer’s website.
• Follow official instructions carefully when updating BIOS.

Updating BIOS can often resolve subtle hardware control issues that cause slowdowns.

Adjust Virtual Memory Settings (Paging File)

Incorrect paging file settings after updates may contribute to sluggish behavior.

• Go to System Properties → Performance → Advanced → Virtual Memory.
• Try setting a custom size (e.g., 1.5x to 2x your physical RAM size).
• Reboot after changes.

Check Event Viewer for Storage Warnings

The Windows Event Viewer can reveal storage-related delays:

• Look for Event ID 129 (Storport) or Event ID 153 (Disk) under System logs.
• These may indicate hardware I/O timeouts.

Summary Table

Closing Thoughts

💭 Performance problems where “CPU is low but system is slow” are particularly frustrating because Task Manager doesn’t show an obvious culprit. However, with careful step-by-step checks—including storage, drivers, background tasks, and BIOS settings—most users can resolve these issues without advanced technical skills. As future updates are released, many of these problems may also be automatically addressed.

✔️You might also find these helpful:

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▶︎Why a Clean Install Might Be the Best Fix for Your PC

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タグ: Troubleshooting Guide, Windows 11, BIOS Settings, KB5039302, June 2025 Update, Windows Update Failure, Driver Issues, Slow PC, Low CPU but Slow, Storage Delays