The tool is updated very frequently, and attempts to make sure it removes all AIM viruses. As long as the author is aware of the virus, it is removed by AIMFix.
If you are concerned with the authenticity or safety of downloading AIMFix, refer to the "100% free" award AIMFix has garnered multiple times from Softpedia download archive, which certifies it free of all malware (viruses, trojans, and spyware). There is also a users page where you can see a list of universities and organizations that use AIMFix.
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