Forum posts for dllhost.exe

Dllhost.exe*32 is unable to release 32-bit resources during uninstallation on a 64 bit machine

I am installing 32 bit application, in compatibility mode, on Windows 2008 R2 Server i.e. a 64-bit O.S.
The Installation and the Functionality is working fine.

But, when trying to uninstall the application, we are receiving a error related to ‘COM Surrogate’. This error occurs randomly.

A message box is displayed saying “Close the below applications before uninstallation” and it displays the “COM Surrogate (Process ID)”. The ProcessID displayed is of the dllhost.exe*32 process. This is the special dllhost.exe, launched in 64-bit OS to support the 32-bit applications in compatibility mode. The 32-bit binaries required for the application are hosted by this exe. The life of this exe is only when any of the 32-bit application is running on a 64-bit machine.

Ideally, during uninstallation, dllhost.exe*32 should die gracefully and the uninstallation should be smooth. But, this is not happening some times.

If I wait for sometime or kill the dllhost.exe*32 manually then uninstallation works fine.

What I am looking at is the exact cause why the dllhost.exe*32 is not able to die gracefully and the resolution to it.

Please, if anyone could help us in this regard.

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