[Anti virus software.]

For personal use at home & workstation at office Kaspersky AntiVirus Personal 5.0.

For server (Windows Server 2003) Kaspersky Business Optimal.

I've done updates every day and our antivirual protection not bad at all.

Only 3 minuses:

1. It use near 30% of system resourses.

2. Too slow.

3. Many troubles when your license key has expired.

[Windows 2003 gets disconnected from network]

Try to enable Service "Windows Firewall/ICS". when it start, disable firewall. It will be enough.