Use PsExec from Sysinternals to simulate SYSTEM account:
psexec -s -i cmd.exe
Then run your install command inside that window. activinspire silent install
[HKEY_LOCAL_MACHINE\SOFTWARE\Promethean\ActivInspire\Settings]
"DefaultLocation"="S:\\SharedFlipcharts"
While you can use the EXE, the most reliable silent install uses the Microsoft Installer (MSI) file. You can extract the MSI from the EXE: Use PsExec from Sysinternals to simulate SYSTEM account:
Open Command Prompt as Administrator and run: Then run your install command inside that window
ActivInspire_Setup.exe /a
This launches an administrative extraction wizard. Choose a destination folder (e.g., C:\Temp\ActivInspire). You will find ActivInspire.msi and several *.cab files inside.