800b0100 Office 365

800b0100 Error Code Office 365 Overview
Difficulty LevelVery High
Resolution:System Fix
Cause:Software Level Conflict
Affected Operating Systems
  • Windows 8/8.1
  • Windows 7
  • Windows 10
  • Windows Vista

How To Fix 800b0100 Error Code in Office 365

Repair Difficulty : High

Step 1: Disable Microsoft Windows Firewall

For Windows 7 and later

1) Press Win+R button and Type “Control” followed by Enter key.
Office Error Code 800b0100 Office 365 img5
2) In Control Panel , Open Windows Firewall.
Office Error Code 800b0100 Office 365 img6
3) On left hand side you will find “Turn Windows Firewall on or off”
Office Error Code 800b0100 Office 365 img7
Note: If you are logged in as Guest user you may be asked to enter Admin Password
Office Error Code 800b0100 Office 365 img5
4) Turn Off Windows Firewall and Press “OK” Button.

Note: You can activate Windows Firewall after Office 365 installation is complete.

Step 2: Reset Internet Explorer Security settings

1. Now, tap on Start button.

start
2. Enter 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: Disable Antivirus

– Open Your Antivrus
– Disable it till the Office 365 installation is going on. Check manufacturer website for more details.

Step 4: Try the installation again

In most case 800b0100 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