Hi,
I was installing "ls2004.exe" (Lan Suite) from http://www.software602.com on a Slackware Linux 10.2 system using wine 0.98 from your website when at the end of the installation this error was coming up !
I doubt that this app can ever fully work in Wine. A mail server isn't the problem, an anti-spam filter shouldn't make a problem too, but a firewall and NAT need the windows packet filter. There's not much sense in allowing Windows apps to configure the Linux packet filter. There are many Linux apps that can do that much better, and it's a very low-level thing. The anti-virus functionality depends on how it works. If it's a check that just opens a file and checks it, then there's no reason why it shouldn't work, but if it has an on-demand checker, than it needs very deep kernel integration too.
Stefan Dösinger
PS: In general, general problems with applications should be discussed at the wine-users list. A mail subject is a good idea too ;)