Checking References Automatically Through Code?

I have an excel add-in that has got few macros which require two references,

1) Microsoft Word 12.0 object library
2) Microsoft Internet Controls

I have checked both these references and the macros are running perfectly on my PC. but when I distribute this add-in, sometimes the references are checked but sometimes it gives an error and the user is required to check the reference again.

Can i use some code to automatically check these two references. or is there some other easier way to get rid of this error.