OCX Files are ActiveX Dlls ... Most often used by Visual Basic for Com interface ...
Whats happening with you is that you'd have installed the program from Administrator's account, so the dependencies and keys were registered with Admin's account .. But when you try to run as another user, the OCX file is not registered with it ..
If you are lucky it can be registered with this command ..
First search the file ..It would be in Windows System folder ..
Do this
Start > Run > Cmd <Press Enter>
On the Command Prompt type this :
Regsvr32 Filepath\Oqbttn.ocx <Press Enter>
Or see
This page ..