i'm not familiar with vista way of working with .dll and .ocx files , but in XP u can register the .dll or .ocx by going to the "Start" button, click the "Run" and there you type "regsvr32 path\to\the\file.ocx". Example "regsvr32 d:\Games\Live for Speed\Tweak\comdlg32.ocx" (without the quotes). You can try it anyway.