Pulse secure error 1603 is a fatal error that occurs on a Windows 10 computer. The error mostly occurs while you try to install a software. If you are facing this issue, carry out the steps that are given below to fix the error.
Step 1: Closing Background Apps
If you are running any other applications, close them and try to install the software.
Press the Windows and X buttons together to launch the Task Manager window.
Select the Processes tab, select a running process, and click on the End Task button.
Similarly, close each process and check whether you are able to continue the installation without the error.
Step 2: Checking The Software If It Is Already Installed
If you have already installed the same software on your computer, you may receive the error.
Press the Windows and R buttons together to open the Run dialog box.
Now, type appwiz.cpl in the Search section and hit the Enter key.
If you find that the software has already been installed, select the software and click on the Uninstall button.
When prompted for confirmation to remove the software, select Yes.
Once the software is removed completely, you can reinstall the antivirus software. This will be helpful to fix Pulse secure error 1603.
Step 3: Checking The Hard Drive Space
If the hard drive is full, you have to free up some space to install the software.
Check the program's HDD storage system requirement.
Now, check your hard drive for the available space.
Press the Windows and E buttons together to launch the File Explorer window.
Select the This PC tab on the left panel.
Now, right-click on the C: drive and select the Properties option from the displayed list.
Click the General tab to see the space available on the drive.
If you don't find enough space on the drive, uninstall the unwanted applications from the computer to free up space.
Now, try installing the software and check whether the Pulse secure error 1603 is resolved.
Step 4: Restart the Windows Installer Service
Launch the Run dialog box, enter services.msc in the search section, and click OK.
Now, locate the Windows Installer Service and double-click on it.
If you find that the service is stopped, click the Start button. If it is running, select the Stop button and then click the Start button.
Click Apply and then restart your computer to fix the Pulse secure error 1603.