0x404 Office 365

0x404 Error Code Office 365 Overview
Difficulty LevelHigh
Resolution:Manual
Cause:File Corruption
Affected Operating Systems
  • Windows 8/8.1
  • Windows 7
  • Windows 10
  • Windows Vista

How To Fix 0x404 Error Code in Office 365

Repair Difficulty : High

Step 1: Disable Microsoft Windows Firewall

For Windows 8
1) Press Win key + Q. A search box will show up on right hand side.
Office Error Code 0x404 Office 365 step 6
2) In Control Panel , Open “Windows Firewall”.
Office Error Code 0x404 Office 365 step 7
Office Error Code 0x404 Office 365
3) Tap On “Turn Windows Firewall on or off”
Office Error Code 0x404 Office 365 img 9
Warning: You will need Administrator rights to disable Windows firewall.
Office Error Code 0x404 Office 365 img10
4) Turn
Off Windows Firewall and Press “OK” Button.
Office Error Code 0x404 Office 365 img11

Step 2: Temporarily turn off Proxy Settings

1) Goto Control Panel.
Microsoft Windows 7 : Click Start and then Click On Control Panel from Right window.
Microsoft Windows 8 : Press Windows key + R and type “Control” and Press Enter.
Office Error Code 0x404 Office 365 img 9
2) In Search Box Type Internet and Click on “Internet Options”.
3) Select Connections Tab and then Click On LAN Setting.
Office Error Code 0x404 Office 365 img 11
4) Turn off “Use a proxy server for your LAN” if its already ON.

Step 3: Check System Integrity

1) Press Windows + R
Office Error Code 0x404 Office 365 img14
2) Type cmd and Press Enter.
Office Error Code 0x404 Office 365
3) Type “sfc /scannow” and press enter.
Office Error Code 0x404 Office 365 img18
Note: If you are logged in as Guest user you will be asked to

Step 4: Try the installation again

In most case 0x404 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