Windows Update troubleshooting
Record the failing update and code.
Check Update history for the update identifier and exact error. Note whether the problem is downloading, installing, or restarting. Start with the matching error guide and keep a backup before system recovery steps.
Find your exact error
All Windows & BSOD errors →0x0000007E
A system thread threw an unhandled exception. A very common Windows BSOD caused by drivers.
Windows & BSOD0x000000EF
A critical system process (winlogon, csrss, lsass) has terminated. Typical causes include malware and bad update.
Windows & BSOD0x0000003B
A system service threw an exception. Caused by drivers or system files.
Windows & BSOD0x00000050
Windows accessed an invalid memory address. The usual suspects are defective RAM, corrupt driver and overheating.
Windows & BSOD0xC004F074
Windows could not contact the activation server or the key is invalid. Typical causes include hardware change and offline PC.
Windows & BSOD0x80070005
Windows Update failed due to permissions or blocking. It's also often linked to corrupted UpdateDB.