Daniel Mercer
Senior Windows Systems Engineer & Technical Content Specialist
8+ years experience · Based in the United Kingdom
Biography
Daniel Mercer is a Senior Windows Systems Engineer with more than 8 years of hands-on experience diagnosing and repairing Windows operating systems across enterprise, SMB, and consumer environments. He has resolved thousands of complex incidents involving Blue Screen of Death (BSOD) crashes, Windows Update failures, driver conflicts, registry corruption, boot loops, and performance degradation on Windows 10 and Windows 11. Daniel specializes in kernel-level debugging using WinDbg, BSOD minidump analysis, Windows Reliability Monitor diagnostics, Group Policy troubleshooting, and PowerShell-based remediation. He has supported deployments for finance, healthcare, and education organizations, and contributes technical documentation to community knowledge bases trusted by IT professionals worldwide.
Areas of expertise
- Blue Screen (BSOD) Crash Analysis
- Windows Update Troubleshooting
- Driver & Hardware Conflict Resolution
- PC Performance Optimization
- Registry & Group Policy Repair
- PowerShell Diagnostics & Scripting
- Boot, Recovery & UEFI Issues
- Endpoint Security Hardening
Certifications & credentials
- Microsoft Certified: Windows Server Hybrid Administrator Associate
- Microsoft Certified: Modern Desktop Administrator Associate
- CompTIA A+ (Core 1 & Core 2)
- CompTIA Network+
- ITIL 4 Foundation
Published articles (7)
How to Fix CRITICAL_PROCESS_DIED on Windows 11 (Complete 2026 Guide)
CRITICAL_PROCESS_DIED (stop code 0x000000EF) is one of the most frustrating Windows 11 crashes because it often points to a different cause every time. Here's how to find yours.
Fix Windows Update Error 0x80070002 on Windows 10 and 11
Error 0x80070002 means Windows Update can't find a file it expected. The fix is almost always to reset the Windows Update components and clear the download cache.
Fix 100% Disk Usage on Windows 10 and 11 (Engineer-Verified)
100% disk usage almost always traces back to one of seven culprits. Here's how to find and fix yours in under 20 minutes.
Device Manager Code 43 — Why It Happens and How to Fix It
Code 43 doesn't always mean the device is dead. Half the time it's a driver or USB power management issue you can fix in five minutes.
Windows 11 Slow Startup: 10 Fixes That Actually Work
A clean Windows 11 install should reach the desktop in under 15 seconds on modern hardware. If yours doesn't, one of these ten issues is almost certainly why.
Wi-Fi Keeps Disconnecting on Windows 11? Here's the Real Fix
Intermittent Wi-Fi disconnects on Windows 11 are almost always one of four things — power management, driver, band steering, or router firmware.
How to Remove Malware from Windows Without Third-Party Antivirus
Windows already includes everything you need to remove most malware — if you use the tools in the right order.