Your only hope is to load a professional anti virus program and then run every registry scanning program they have until the problem is found. Once the problem is found hopefully it can be corrected but many times registry viruses cannot be removed and this really is nothing any anti virus software company can help. It is sort of like why they cannot cure the common cold. They cannot cure the common cold because there are too many bacteria involved in it. In registry viruses there is just too many variables that prevent it from being removed successfully.