I have a friend with the following -

XP Home+SP1 - Outlook Express 6.0 - AVG 6.0 (Free) with Mail Scan Enabled and OE Plugin Enabled

Every so often when she goes to Delete Messages from Deleted Items - she gets an AVG Virus Alert and infected Files are sent to the Vault

What I'm not understanding is - why is the Virus\Worm not detected as it arrives ?

I understand these Alerts usually refer to the Netsky Worm

Associated question - some Viral Atrachments eg some Netsky variants - have a .zip extension - does this indicate a truly Compressed File or is it just a misleading misnomer?

Thanks

I cant answer the avg question, there are much better AV programs around for free.

The second question is yes, a lot of the time they are real zip files. People are stupid enough to still unzip and run them.

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http://www.anti-trojan.org