30390-66 Office 365

30390-66 Error Code Office 365 Information
Difficulty LevelHigh
Resolution:Virus Issue
Cause:File Corruption
Affected Operating Systems
  • Windows 8/8.1
  • Windows 7
  • Windows 10
  • Windows Vista

How To Fix 30390-66 Error Code in Office 365

Repair Difficulty : Medium

Step 1: Disable Windows Firewall

For Windows 8
1) Press “Win+R” button and Type “Control” followed by Enter key.
Office Error Code 30390-66 Office 365 step 6
2) Open “Windows Firewall” from Control Panel Window
Office Error Code 30390-66 Office 365 step 7
Office Error Code 30390-66 Office 365
3) Click On “Turn Windows Firewall on or off”
Office Error Code 30390-66 Office 365 img 9
Note: If you are logged in as Normal user you may be asked to login as Administrator.
Office Error Code 30390-66 Office 365 img10
4) Finally Click on “Turn off Windows Firewall (not recommended)” under each of the active network connections.
Office Error Code 30390-66 Office 365 img11

Step 2: Reset Internet Explorer Security settings

1. Now, tap on Start.

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 button.

Step 3: Check System Integrity

1) Press Win + R
Office Error Code 30390-66 Office 365 img14
2) Type cmd and Press Enter.
Office Error Code 30390-66 Office 365
3) Type “sfc /scannow” and press enter.
Office Error Code 30390-66 Office 365 img18
Note: You will need Administrator rights to run the command.

Step 4: Try the installation again

In most case 30390-66 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