Guides from the
Windows Help Desk
Every guide follows our editorial policy: the exact problem first, the safest fix first, and clear notes on which versions it applies to.
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Error code 0xc0000428: how to fix “Windows cannot verify the digital signature”
Fix boot error 0xc0000428 in Windows 11 and 10: start once without signature checks, remove the driver named in the error, run Startup Repair,…
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“Your version of Windows has reached the end of service”: how to fix it
Seeing “Your version of Windows has reached the end of service”? Here’s what it means, which Windows 11 versions are affected, and how to…
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Error 0x80070426: how to fix it in Windows Update and Microsoft Store
Error 0x80070426 means a Windows service isn’t running. Start Windows Update, BITS and the Microsoft Account Sign-in Assistant, reset Store and update components, and…
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Windows 11 run as different user: 4 ways (and fixes)
How to run a program as a different user in Windows 11 with Shift + right-click, the runas command, PowerShell or the Start menu,…
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How to upgrade Windows 10 Home to Pro (3 ways)
How to upgrade Windows 10 Home to Pro, or Windows 11 Home to Pro, with the Microsoft Store, a product key or the generic-key…
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How to delete Windows.old in Windows 11 and 10
How to delete the Windows.old folder safely in Windows 11 and 10, with Settings, Disk Cleanup or Command Prompt, what to check first and…
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Error 0x800f081f: how to fix it in Windows 11 and 10
Error 0x800f081f means Windows can’t find the source files for .NET Framework 3.5, a DISM repair or an update. Here’s how to give it…
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Microsoft Edge won’t open? 7 fixes for Windows 11 and 10
Microsoft Edge won’t open on Windows 11 or 10? End stuck processes, recover an off-screen window, start without extensions, repair Edge from Settings, try…
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100% disk usage on Windows 11: how to find the cause and fix it
Task Manager stuck at 100% disk on Windows 11? Find the process responsible, cut startup apps, pause syncing, reduce indexing, check RAM and drive…
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CRITICAL_PROCESS_DIED on Windows 10 and 11: how to fix it
CRITICAL_PROCESS_DIED (0xEF) blue screen on Windows 10 or 11? Undo recent changes, repair system files with DISM and SFC, check the drive, fix drivers…