Visual Basic error 50003

[GiftedSailor]

My OS is Vista. I'm using a Dell E 521. I have several VB programs that I've transferred from my old hard drive to the new one, and every time I try to open one of them I get the error"Run time error 50003 unexpected error". Anyone know what causes this and how to repair it? 

[BC_Programmer]

one of the OCX or DLL files referenced by the project is a different version on the new hard drive (assuming a new install) then the old one.

Either that, or they are no longer in the same location the project file references.