Fergie, I agree with BigChuck and it is a fact that Hearme no longer offer support for their Voice Creator product but your error message refers to Voice Contact which is another (presuably now unsupported) Hearme product.
What are you trying to do - join in with Mudcat events or enter into personal communication? In either case, The one Paltalk program does offer a very good (and currently superior)alternative to the Hearme products.
With regards to the error message, try uninstalling and reinstalling your hearme product. If that fails,I've a horrible feeling that this one may turn out to be a Windows problem...