Cannot hide cmd popup from appearing

Hello everyone,
I am trying to register TLB files from installer. For that, i am using the InstallScript LaunchAppAndWait function, that calls regtlibv12.exe to register TLB files. But, even though i have used LAAW_OPTION_HIDDEN, still I am getting the cmd popup (though momnetarily).

Any idea on how can I suppress this prompt from appearing?

Thanks in advance,
Shodhan