[Fixed] How to Solve Error Code 30121 In Microsoft Office 365/2019/2021

The above Microsoft office 365/2021/2019 installation Error code 30121 primarily appears when you try to open Office365,Office 2021 and 2019 Installation program on a Windows 11 and Windows10 computers  It has been observed that this office installation Error code 30121 needs to repair or a reinstall the office 2021 program and you can read the below information for more knowledge.

Disclaimers: Before you attempt to fix the Microsoft office Program issue, we highly recommend taking a registry back up and set a system restore point. Because this process involves repair on registry and changes. In case if something goes wrong during this process, we can revert back the settings and we can does a system restore? Also, save your documents, emails, spreadsheets, and office Programs related files and back It up.

(In case if you not sure how to back up, consult the Experts to help you)

error code 30121

Solutions for Microsoft Office 365/2021/2019 Installation Error Code 30121

Microsoft Office 365/2021/2019 installation programs will not open at all and gives you an Error code 1058-4. Even you get a different office Error code 30121 when you try to repair or uninstall windows. This is found on Windows 8.1 upgraded to windows11 and Windows10 machines recently.
First do a disc clean up so that we can remove old-Microsoft office 356 installation traces from your computer.

How to do disc-cleanup:-

Method-1 Creating shortcut

1. Right click on your computer home screen, Go to “new” in the list and select “Shortcut “.
2. After clicking on a shortcut, a command prompt windows update will open and type the command “cleanmgr.exe” in it and name as you like to remember it as a disc clean up shortcut button.
3. Then an icon will appear on your home screen, click on it and select required disc to clean up. (Normally Software gets installed on DRIVE:C which is default here).
4. Then a list of folders will appear, select temp folder, recycle bin and proceed to clean up the disc.

Meanwhile, watch this video to follow above steps for a disc cleanup.


1. Open drives windows (Shortcut CTRL+E and choose PC name from right side panel)
2. Right click on C:drive and select properties.
3. In the properties windows select Disc clean up button to proceed and then follow the step-4 from method -1.

It takes sometime if the computer have too many junk files to cleanup.

If you have a different issue, we are welcome to investigate and provide a relevant solution. Here are few things which we can try to resolve this issue.

1. The first attempt is to check if there is any previously installed Office 365 program with the same version.

That needs to be removed and then the Office 2021 installation should be commenced from the beginning.

2. If we don’t see any previously installed similar Microsoft Office 2019 programs, it is recommended to run a network check through command line.

The command prompt should be opened using the administrative permissions and then network command which needs to be executed as follows.

Nslookup office365.com

Irrespective of the version of your office Installation program, it is a very common line to check the status of your previously installed office 365 program.

The server name should not show you as unknown.

3. If the server name is show as unknown, restart your router or the modem and execute the same steps again.

4. If the server check passes correctly, then use the other setup file which is related to 64 bit from advanced steps under office Program setup file.

5. If the Microsoft office 365/2021 installation Error code 30121, still appears after the installation, attempt to repair the office programs.

6. If the Office repair fails again with some office 365/2019 installation Error code 30121, a reinstallation of office is required.

7. If the Office repair succeeds and you still see the same Microsoft 365/2021 installation Error code30121, then perform a system file scan on your windows using the following steps.

You can perform a system file scan process which can be started on a command prompt window with administrative rights.

How to do a SFC Scan:-

1. Click on the start button and type “cmd”
2. Open “Command prompt window” and type “SFC/SCANNOW” PRESS enter button,
3. The scanning process start and this process takes sometime to finish. Please wait until it gives results.
SFC Scan
This video shows how to do SFC Scan:

If the computer says, no integrity violations found, then try to reinstall the office installation program which may sometimes replaces the corrupted files on your office program.
If that fails to work, it is required to repair the Windows operating system.
It is also found that Windows will scan very slowly and may show you a sluggishness while opening the events on your computer.
It is also recommended to run the windows updates regularly, make sure it is set to automatic updates. Otherwise manually install the updates from your end. The windows 10/11 updates will download the latest drivers required for your computer hardware irrespective of brand or the manufacturer.


If you would like to have a support taken through a technical assistance, feel free to initiate a chat or write us on support@microsoftliveassist.com with the complete information of the computer make and model, office or windows operating system versions and the best time to reach you for support.
We provide support for Microsoft products like Windows update and Microsoft Office and Outlook unlicensed Product, we can also setup free tools provided and included with Microsoft Windows and can train you on how to use them to maintain the health of your computer.

In Conclusion,

You can also ask for System repair Image support or some Recovery help, we also restore your computer to a point when it was working fine without any issues.
Feel free to chat with us for any support. A free assistance can be provided for all the basic troubleshooting without any additional resources.
Error Code 30121

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