Some anti virus and anti spyware software will not be able to detect more malicious virus and Trojan horse infections because they do not contain a signature database which is capable of detecting various infections.
By constantly updating your anti virus or anti spyware application with the latest signature database updates you will enable your security tool to have a better chance of detecting more difficult to find infections which it can then quarantine or remove.
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The company might not have caught up with the malware or you might not have upgraded the detection signatures.