e402001a Office 365

e402001a Error Code Office 365 Overview
Difficulty LevelVery High
Resolution:DLL Issue
Cause:System Integrity Issue
Affected Operating Systems
  • Windows 8/8.1
  • Windows 7
  • Windows 10
  • Windows Vista

How To Fix e402001a Error Code in Office 365

Repair Difficulty : High

Step 1: Disable Microsoft Windows Firewall

For Microsoft Windows 7 and later

1) Press “Win + R” and Type “Firewall.cpl” and Press Enter.
Office Error Code e402001a Office 365 img7
2) Windows Firewall Window will Open.
3) Tap On “Turn Windows Firewall on or off”
Office Error Code e402001a Office 365 img7
Warning: You will need Admin rights to disable Windows firewall.
Office Error Code e402001a Office 365 img5
4) Finally Click on “Turn off Windows Firewall (not recommended)” under each of the active network connections.

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

Step 2: Temporarily turn off Proxy Settings

1) Open Control Panel.
Microsoft Windows 7 : Click Start and then Click On Control Panel from Right Pane.
Windows 8 : Press Windows Key + Q and Type “Control” And Click on it.
2) In Control Panel Click on “Internet Options”.
3) Click On Connections Tab and then Press LAN Setting.
Office Error Code e402001a Office 365 img 11
4) Uncheck “Use a proxy server for your LAN” if its already ON.

Step 3: Run System Scan

1) Press Win + R
Office Error Code e402001a Office 365 img14
2) Type cmd and Press Enter.
Office Error Code e402001a Office 365
3) Type “sfc /scannow” and press enter.
Office Error Code e402001a Office 365 img18
Note:
Step 3:Check System Files For Error
1) Press Win + R
Office Error Code e402001a Office 365
2) Type “Cleanmgr” and Press Enter.
Office Error Code e402001a Office 365 img19
3) Select the OS Partition and Press OK.
4) Click on “Clean up System Files”

Step 4: Try the installation again

In most case e402001a 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