This problem can occur with McAfee antivirus software that is running a signature before 4266.
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.
For more information about IIS 5.0 logging, click the following article number to view the article in the Microsoft Knowledge Base:
ID do Artigo: 821749 - Última Revisão: 20/06/2014 - Revisão: 1