Installing plugins ?

I have the following problem:
I can't make plugins to work on PCs different from the one I use to develop them.
I couldn't even make Skeleton or other samples work.

The error message is: "the plugin could not be loaded (14001) ( 48 :: 46 )"
(this is a translation from a spanish message)

Is there anything else I might need to install on the other machines, besides copying the .aex?

The PC that I use to develop has XP in english, and the others have XP in spanish. Could this have anything to do with the problem?

Thanks!
Maximo