643 Office 365

643 Error Code Office 365 Overview
Difficulty LevelMedium
Resolution:Manual
Cause:Malwares/Virus
Affected Operating Systems
  • Windows 8/8.1
  • Windows 7
  • Windows 10
  • Windows Vista

How To Fix 643 Error Code in Office 365

Repair Difficulty : High

Step 1: Disable Firewall

For Microsoft Windows 7 and later

1) Press “Win + R” and Type “Firewall.cpl” and Press Enter.
Office Error Code 643 Office 365 img7
2) Microsoft Windows Firewall Window will Open.
3) On left panel you will find “Turn Windows Firewall on or off”
Office Error Code 643 Office 365 img7
Note: You will need Administrator rights to disable firewall.
Office Error Code 643 Office 365 img5
4) Finally Click on “Turn off Windows Firewall (not recommended)” under each of the active network connections.

Warning: Please Activate Microsoft Windows Firewall after Office 365 repair is complete.

Step 2: Reset Internet Explorer Security settings

1. Now, click on Start.

start
2. Type the command “inetcpl.cpl” and click OK button.
3. Click on the “Security” tab.

inetcpl security
4. Click “Reset all zones to default level” button at the bottom of the window.
5. Click OK again.

Step 3: Repair System Files

1) Press Windows + R
Office Error Code 643 Office 365 img14
2) Type cmd and Press Enter.
Office Error Code 643 Office 365
3) Type “sfc /scannow” and press enter.
Office Error Code 643 Office 365 img18
Note:
Step 3:Run Disk Cleanup Utility
1) Press Win + R
Office Error Code 643 Office 365
2) Type Cleanmgr and Press Enter.
Office Error Code 643 Office 365 img19
3) Select the OS Drive and Press OK.
4) Finally Click on Clean up System Files

Step 4: Try the installation again

In most case 643 error code in Office 365 should be resolved by now, if however the problem still persists please get your system checked by an expert.

If you are not able to resolve the issue following above steps, you can contact our 24×7 Chat Support for help.

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