What this means is that it wasnt scanning archive files correctly, (a lot of those .EXE files are compressed to save space using this sort of packing tool ) , and thats a lot of files on your drive.According to security rival ISS, which unearthed the vulnerability, the problem lies with the DEC2EXE module in the Symantec Anti-Virus Library, a part of the virus detection engine that makes it possible to detect malware inside executable files compressed using the freeware UPX (Ultimate Packer for eXecuteables) format.
Read here for more details of the vunerability
http://www.infoworld.com/article/05/02/ ... law_1.html
Luckily this is a simple fix as they have automated updating



