A recent finding of mine has been that despite having to pay ridiculous amounts of money to keep NAV registered, it doesn't catch as many worms or viruses as AVG does. I have them both running, and earlier I (deliberately) visited a virus infected URL - AVG alerted me of a backdoor being placed in my Documents and Settings folder...NAV (with Auto Protect enabled) did not.
Anyway, if you receive an .exe file via any form, particuarly by IRC or email, you should be caution, and if it is from someone you don't know, delete it straight away without opening it.
My previous posts still apply
Regards,
