I want to enable WPA-PSK, but it asks for a network key - where am I supposed to find this? I am using the router settings page in my browser. Do I need to change any settings elsewhere too? I am using a Netgear wireless ADSL firewall router DG834G. I have a pc that uses Windows XP Home and a laptop that uses Windows 2000 on the network. I also have VOIP - will it affect this?

You make up the network key yourself. This generates the WPA encryption key through a standardized algorithm used by all WPA-enabled network devices. Under the old WEP standard the algorithm could vary between manufacturers so if say you had a Linksys router and a Belkin wireless adapter in your PC you couldn't enter one simple "passcode" on both of them, you had to enter the (very long) hexdecimal encryption key directly. Once the wireless network is encrypted it's completely transparent to the user. VOIP should work fine. Note while WPA is more secure than WEP it's still theoretically possible to break WPA encryption if the hacker collects enough packets to examine; it just takes longer than with the older WEP protocols. You should still plan on changing the WPA network key every few weeks to discourage this.

Thanks very much - I can't believe it was so easy after all the time I spent searching through help screens!