What is INSTALLER-ERROR-1603?
Windows Installer error 1603 ranks as a medium-severity software runtime issue in our database. Fatal error installing MSI package. Installation failed. The usual suspects are insufficient permissions, corrupt installer and full disk. Use the steps below to track down and fix the cause.
Common Causes
- Insufficient permissions
- Previous installation not removed
- Corrupt installer
- Full disk
Step-by-Step Fix Guide
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1
Run the installer as administrator
Run the installer as administrator resolves the majority of INSTALLER-ERROR-1603 cases on its own, making it the logical starting point.
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2
Uninstall the previous version
For the minority of cases that need more work, the later steps dig into less usual runtime instability causes.
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3
Clean the temp folder
"Clean the temp folder" covers a less common but documented cause of INSTALLER-ERROR-1603.
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4
Run Windows Installer Cleanup
"Run Windows Installer Cleanup" targets corrupt installer, one of the documented causes of INSTALLER-ERROR-1603.
Commands & Diagnostics
msiexec /unregister
msiexec /regserver
Frequently Asked Questions
In most cases, insufficient permissions is behind INSTALLER-ERROR-1603. Previous installation not removed, corrupt installer and full disk can trigger it too.
Most INSTALLER-ERROR-1603 reports resolve after "Run the installer as administrator". The rest of the guide above is there for the cases that don't.
As a medium-severity issue, INSTALLER-ERROR-1603 is more of a stability annoyance than a hardware risk — the steps above should clear it up.
Usually. INSTALLER-ERROR-1603 is fixable with the steps above; a full Windows reinstall is rarely necessary unless everything else has failed.
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