How to fix Windows 10 update error 0x80070643

Lately, Windows 10 users often face the issue called error 0x80070643 that pops up during installation update for Windows Defender Antivirus. This bug may be caused by corrupted system files, damaged hard drive, Windows Registry Errors, malware, e.t.c. Accordingly, the key to solving the problem is, in each of these cases, different.