1644 is a windows installer result. One or more customizations aren't permitted by system policy.
Code reference and safe checks
Read the exact screen and operation before selecting a repair. This page does not run commands or collect files, keys or logs.
What this value means
One or more customizations aren't permitted by system policy.
This is a Windows Installer return code; use the package and installer log rather than treating it as a stop code.
| Code | 1644 |
|---|---|
| Symbol | ERROR_INSTALL_TRANSFORM_REJECTED |
| Windows family | Windows installation errors |
| Source level | Microsoft code and symbol entry |
Safe next steps
- For 1644 (ERROR_INSTALL_TRANSFORM_REJECTED), record the MSI product, package version, exact exit code, and installation log or on-screen message.
- Check whether another installation, reboot, policy, or product version is involved before retrying the official installer.
- Do not disable security software or bypass organization policy as a generic MSI fix.
After one step, repeat the original operation and record whether this same code returns. A different code needs a fresh interpretation.
What this code cannot prove
The source establishes the identifier and reference meaning. It does not establish the cause on your specific PC.
If the result differs from the documented message or a repair could remove data, stop and use the official source or vendor support.
Official reference and verification
Source type: Microsoft code and symbol entry. Checked against the source set on Nov 2, 2026.
The reference gives the meaning of this identifier. It does not inspect your PC or guarantee that one repair will work.