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Microsoft Office 365/2021/2019 Installation Error code 1603 encountered that many users were having trouble repairing or installing office programs on their Windows and Mac computers. The major issues pop up due to Office licensing, Windows updates, insufficient system resources like disk space, Internet connectivity, etc. In this article, it gives solutions for different kinds of office issues related to office 2021/2019 error code 1603.

Microsoft Office 365/2021 Error Code 1603 Returns the below Error Messages

Something went wrong Error code 1603 Go online for more help

When you are starting an Office application, you receive an error stating that “Something went wrong”. If operating system is not able to add or remove the products requested, It requests you to verify the file’s signature and install office 365 products. Usually, it returns error code series 300XX, or 1xxx series depends on cause of the related issue.


The office is Busy, there is an issue starting the Office 365/2019 program Installation

Error “Office is busy” pops up when you try to open any office 365/2021/2019 program like word, excel, PowerPoint etc., and office is already in progress. A message shows that “we are updating you to add or remove some programs”.


We are sorry, but we are not able to begin your office 365 program

This program is common error in the Windows operating system that is caused due to the failed services of a program. Windows Installer services are found to be not working, they cannot install an Office 365/2021 product.


Sorry, we ran into a problem Error code 1603 – Sorry installation cannot continue as no compatible office products are detected

Windows displays a message showing that your system ran into a problem, and it needs to restart system. A Microsoft Windows Operating system is announced in various bit of versions depending on the hardware architecture such as 32 and 64. It is necessary to install similar versions of Office that suitable for Windows.


We are sorry, but we cannot verify the signature of the files needed to install your office 365/2021 product

An Office 365/2021 is an product package available in different various forms such as a disc or click-to-run. In the case of a disc failure, you might see this error message We are Sorry, But We Can’t Verify the Signature error message which says signatures of files required to install the office 2021 product.

Internet connection required to fix Office 365/2019 Error code 1603

This error message happens due to internet problems when performs an online repair for your office 365/2019 product. You can do a quick offline repair. And also, Microsoft Office 365/2021 installation needs an proper internet connectivity

The new Office 365 suite comes with click-to-run feature that has a short setup file that will start Microsoft Office installation. Due to intermittent connection or connectivity failures, you will see Microsoft office 365/2021/2019 installation error code 1603.

Background Installation ran into a problem

Background installation pops up when Office 365 installation program-related files are corrupted. It is necessary to repair Office applications. And also a malware and or virus related issues can be checked in PCs

Unable to begin Office 365/2021 installation program

The message shows that office 365/2021installation program has been stopped by your Windows. This should be scanned using Windows system files. This also shows that Office-relevant files are missing from office 365 Program folders. It has been encountered with any kind of the clean-up programs, and system restores will help you to fix the issues.

Check your PC to fix Microsoft office 365/2021 error code 1603

An event viewer is log of every action on your computer that records all events. This Windows built-in feature that provides all information for the problem-causing keys. They are caused due to failure of the Windows-related services and its executable file is unable to read the necessary files when installing Office 365/2021/2019.


Perform system file SFC scan

To Run a system file SFC scan the windows operating system

First Open a command prompt (CMD) in administrator mode and then Run command SFC/SCANNOW

SFC Scan

If you see any file violations still exists after scan then move to the Event viewer to check what has been caused by the office 365/2019 program installation error 1603 


How to use Event viewer to check office error logs?

Click to start button and open the Run command prompt window.

To open Event viewer logs, type “EVENT VIEWER” command and then press enter.


And tap double to “windows log” and then select to the “Applications “

Many logs are visible in the Centre panel. Filter the logs and check office-related problems and warnings by selecting Filter current log option.

error code 1603

Finds critical error logs that cause an Microsoft office 365 installation error code 1603. If there are no reasons for these issues to be found, then perform a clean office 365/2021 installation.

How to Fix the Microsoft Office 365/2021 Error Code 1603

Sometimes the office 365/2021 products will install due to many reasons such as internet connectivity, dependencies for the office 365/2019 product, or any viruses that affected system files, etc. Perform a clean installation to remove the traces of office program files that existed from older versions or by multiple office 365 program installation trails.

Repair/Uninstall the office 365/2021 program

The following procedure shows you that how to uninstall Office 2016 or 2013 products on your system. For other new versions of Office 365 and try to uninstall Microsoft Office 2021 by using of Control Panel. If that does not work, use this to easily fix the tool or try uninstalling Office manually.

For Windows 10

Firstly, go to control panel from start button

After this, Select Programs and features there to reach a list of installed office 365 programs on your computer

Now, from the list, search for Microsoft Office 365 product and click on Change

After that, a window will open like here showing Add, Repair, Remove options

Then proceed to with repair and wait for sometimes. Once the repair is successful you are ready to use Microsoft office 365/2019 product again

Finally, to uninstall follow the first 4 steps from repair process, and choose to Remove instead of repair


IMPORTANT:. It’s impossible to uninstall office applications (word, excel, publisher etc) individually from total office 365 product. The only way to uninstall an individual app is if you purchased it as a stand-alone version.

Installing Office 365/2021 Product to fix this error code 1603 

Once the uninstall part is over, and then now start performing a clean office 365/2021 installation 

Firstly, go to Microsoft office account and sign into account.

Secondly, check this dashboard and look into product that you have purchased.

After that, Select the “Install Office “option and download it

Finally, check downloads on your system and double-click to the setup file for install.

If the Microsoft Office 365/2019 installation error code 1603 exists, then try the advanced registry fix

Windows Registry Fix

Registry in Windows displays the structure of Windows Operating system and its internal programs. The Hex codes inside the registry will change due to unnecessary programs. To fix this installation error code 1603 in office 365/2010/2016/2019/2021 and deletes the modified Office Registry keys or remove and re-creates the keys with older values.

Note: Don’t do Registry changes if you are not aware of the structure as it damages applications with one single change. Sometimes damages your computer operating system.

Take help from our Online experts regarding any unsolved problems in your system. Also, go to our website for more details and information.

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