Wireless Network Security

[joshua_tree_87]

This is the situation. I am running a 3 PC Wireless LAN network. The host System is
using an ULTRA HIGH SPEED DSL connection. That system has the router, two other PC's
are using LynkSys Wireless USB adapters to connect to the router.. One system is using
Win XP pro and WIN 2000 Pro on a dual Boot. The other is using Win Me and th ehost is
using Windows XP Pro. The router has a 128-bit encryption and the PC is protected with
Zone Alarm the latest version by tomorrow it will have Sygate Personal Firewall.
It also has Norton Anti-Virus 2003 Pro. It does not have any monitoring software to
monitor and scan for Trojans. I think it will be a good idea if it had a program called
Tauscan 1.6 from Agnitum Ltd. This program monitors for any trojans, it resides in the
system tray and could be configured for daily updates. Also, in my opinion the host PC
should have a program called Spybot which could be run at start - up to scan for
keyloggers, malware, spyware, etc. Once the program runs in the background it cleans
all files that it is configured to clean and then just closes and does not stay in the
system tray using up resources.

The two other PC's that are on the network have Sygate Personal Firewall the Free
edition and AVG Anti-virus protection. These two PC's have installed on them the
Tauscan 1.6 Trojan monitoring and scanning program as well as Spybot the ant-spyware
and malware program. Everything is configured for auto updates and to run at least
once a day(not including the anti-virus) allthough that program is configured for the
email clients. Sygate Firewallis configured for auto startup at boot.

This is the question that I have for you for any reason if the host PC where the
router is by any chance gets infected with a virus or trojan what consequences will
the the other PC's might face with the above mentioned security scheme. Also if a
hacker was to get into the host PC what are the consenguences on the two other PC's
will they be at risk(noting the above protection)?

All commands are greatlly appreciated.