5B4 Office 365

5B4 Error Code Office 365 Overview
Difficulty LevelHigh
Resolution:Virus Issue
Cause:Software Level Conflict
Affected Operating Systems
  • Windows 8/8.1
  • Windows 7
  • Windows 10
  • Windows Vista

How To Fix 5B4 Error Code in Office 365

Repair Difficulty : High

Step 1: Disable Firewall

For Windows 7 and later

1) Click Start Button Office Error Code 5B4 Office 365 and in search box type Control Panel Office Error Code 5B4 Office 365 img2 and Click on it.
Office Error Code 5B4 Office 365 img5
2) In Control Panel Window, Click on “Windows Firewall”.
Office Error Code 5B4 Office 365 img6
3) Press “Turn Windows Firewall on or off”
Office Error Code 5B4 Office 365 img7
Warning: You will need Admin rights to enable or disable Windows firewall.
Office Error Code 5B4 Office 365 img5
4) Finally Click on “Turn off Windows Firewall (not recommended)” under each of the active network connections.

Warning: You can activate Microsoft Windows Firewall after Office 365 repair is complete.

Step 2: Proxy Issue

1) Open Control Panel.
Microsoft Windows 7 : Press Win Key and then Select Control Panel from Right Pane.
Windows 8 : Press Windows Key + Q and Type “Control” And Click on it.
2) In Search Box Type Internet and Click on “Internet Options”.
3) Click On Connections Tab and then Choose LAN Setting.
Office Error Code 5B4 Office 365 img 11
4) Uncheck “Use a proxy server for your LAN” if its switched ON.

Step 3: Temporarily Disable Antivirus

– Open Your Antivrus
– Disable it till the Office 365 repair is going on. Check antivirus vendor website for more details.

Step 4: Try the installation again

In most case 5B4 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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  • Posted In: Office 365