Thank you.
Vista does not support retained mode, hence all loaded and unloaded RM functions from DLL was disabled by compiler directive now.
Installer was not tested under Windows 98/ME (I haven't got it) and maybe problems when is Delphi installed incorrectly or non standard like directory name for "Delphi3" across "Delphi 3". But installer has auto-download for newest version .
Best Regards