5-26 Office 365

5-26 Error Code Office 365 Information
Difficulty LevelCritical
Resolution:System Fix
Cause:Malwares/Virus
Affected Operating Systems
  • Windows 8/8.1
  • Windows 7
  • Windows 10
  • Windows Vista

How To Fix 5-26 Error Code in Office 365

Repair Difficulty : Medium

Step 1: Disable Firewall

For Microsoft Windows 8
1) Press Win key + Q. A search box will come up on right hand side.
Office Error Code 5-26 Office 365 step 6
2) Open “Windows Firewall” from Control Panel Window
Office Error Code 5-26 Office 365 step 7
Office Error Code 5-26 Office 365
3) Press “Turn Windows Firewall on or off”
Office Error Code 5-26 Office 365 img 9
Warning: If you are logged in as Guest user you will be asked to enter Admin Password
Office Error Code 5-26 Office 365 img10
4) Click Turn off Windows Firewall (not recommended) under each network
location and then Click “OK”
Office Error Code 5-26 Office 365 img11

Step 2: Temporarily turn off Proxy Settings

1) Open Control Panel.
Microsoft Windows 7 : Click On Start and then Select Control Panel from Right Pane.
Microsoft Windows 8 : Press Windows key + R and type “Control” and Press Enter.
Office Error Code 5-26 Office 365 img 9
2) In Control Panel Window Click on “Internet Options”.
3) Click On Connections Tab and then Click On LAN Setting.
Office Error Code 5-26 Office 365 img 11
4) Uncheck “Use a proxy server for your LAN” if its switched ON.

Step 3: Check System Integrity

1) Press Windows + R
Office Error Code 5-26 Office 365 img14
2) Type cmd and Press Enter.
Office Error Code 5-26 Office 365
3) Type “sfc /scannow” and press enter.
Office Error Code 5-26 Office 365 img18
Note: If you are logged in as Normal user you may be asked to enter Admin Password

Step 4: Try the installation again

In most case 5-26 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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