Hi,

I can't say that I have come across a good free one. Trojans are a bit difficult, the best IMHO is TDS3 from DiamondCS, put you have to pay for it.

I take your point about NAV, it frequently conflicts with other security software if they are trying to do the same thing, so turn it off before using the other software. Moosoft's "The Cleaner" is also pretty good, but you have to pay for it.

A reasonable compromise is to regularly run Trend Micro's "Housecall" and Panda's online scanner. They will pick up quite a few that NAV will miss. Also get RegistryProt from :

http://www.diamondcs.com.au

It can warn you when a problem has arrived that you need to fix.......it IS free.

Also:

http://digilander.libero.it/zancart

You are looking for "Winsonar", it warns you when a background process launches.

You don't mention a firewall? you need one that warns you when something tries to "phone home"

Good luck