Can't register DLL. Why?

Goodday everybody...

I'm not sure whether it's right to post this thread here. Anyway, I found it's the best between the rest.

Well, I have a problem here. I wrote a COM program using VC++. But when I try to register it in one of my office's pc, the following error message appeared:

LoadLibrary("Vehicle.dll") failed.
GetLastError returns 0x00000485.

What happened? It only happens on this particular PC as when I try to register on other PCs, it runs ok.

This is quite urgent as there's a presentation on the system in the next few days. Therefore, any advice will be most welcome.

Thanks.