Windows & BSOD · medium

How to fixWU-0x80070643

Windows Update Failure (0x80070643)

What this error means

WU-0x80070643 shows up as a medium-severity Windows operating system fault. Windows cannot check for or install updates. Error code: 0x80070643. The usual suspects are corrupt SoftwareDistribution folder and stopped BITS service. Work through the steps below in order.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Restart Windows Update

Restart Windows Update.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Clear the update cache

Clear the update cache.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Run the WU Troubleshooter

Run the WU Troubleshooter.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • Corrupt SoftwareDistribution folder
  • Stopped BITS service
  • Error connecting to server