Leo says he doesn't need to run both. Stopzilla is not antivirus either, it's just anti-spyware software. He should uninstall Stopzilla which may not be easy. He should carefully read their support page on how to uninstall it. Spyware is old hat, what he really would want is an anti-malware tool. In fact, Stopzilla could also be the problem with accessing his email attachments. Simply Google "uninstall Stopzilla" and he should find a comprehensive step-by-step to get rid of this.