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HomeTroubleshootingInstallation"Error 1905. Module ... failed to unregister."

1.24. "Error 1905. Module ... failed to unregister."

Applies to:
All products, releases 5.x and newer

While reinstalling Palisade software, I get the error message

Error 1905. Module C:\Program Files\ ... failed to unregister. HRESULT -2147220472. Contact your support personnel.

The error message could mention any file name. Here are a few that we have in tickets in the Tech Support database: AtRiskOL.dll, PalGraph7Server.exe, PTreeOutOfProcessServer.exe, RiskOpt6DE.dll, StatTools5_EN.dll. But you could get this message with any file in our software.

For some reason, the installer is having trouble getting access to files that are already installed, possibly because something is still running. This procedure seems to work:

  1. Restart your computer — not just logging off and on, but a full restart.
  2. Save your license file, if you have a .LIC file in C:\Program Files (x86)\Palisade\System or C:\Program Files (x86)\Palisade\System.
  3. Delete the folder C:\Program Files (x86)\Palisade folder or C:\Program Files\Palisade.
  4. Run REGEDIT, and go to to HKEY_LOCAL_MACHINE\Software\WOW6432Node in 64-bit Windows, or HKEY_LOCAL_MACHINE\Software\Palisade in 32-bit Windows. Under that key, delete the Palisade subkey.

This should let you reinstall the software.

Last edited: 2016-11-04

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