91 Office 365

91 Error Code Office 365 Overview
Difficulty LevelHigh
Resolution:System Fix
Cause:Application Layer Corrupt
Affected Operating Systems
  • Windows 8/8.1
  • Windows 7
  • Windows 10
  • Windows Vista

How To Fix 91 Error Code in Office 365

Repair Difficulty : High

Step 1: Disable Windows Firewall

For Microsoft Windows 7 and later

1) Press “Windows Key + R” and Type “Firewall.cpl” and Press Enter.
Office Error Code 91 Office 365 img7
2) Microsoft Windows Firewall Window will Open.
3) Click On “Turn Windows Firewall on or off”
Office Error Code 91 Office 365 img7
Note: If you are logged in as Normal user you will be asked to
Office Error Code 91 Office 365 img5
4) Turn Off Windows Firewall and Press “OK” Button.

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

Step 2: Reset Internet Explorer Security settings

1. Now, tap 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: Check System Integrity

1) Press Win + R
Office Error Code 91 Office 365 img14
2) Type cmd and Press Enter.
Office Error Code 91 Office 365
3) Type “sfc /scannow” and press enter.
Office Error Code 91 Office 365 img18
Note: If you are logged in as Normal user you may be asked to login as Administrator.

Step 4: Try the installation again

In most case 91 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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  • January 1st, 1970

    Posted In: Office 365

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