netgear dg834n mac update itunes problems

Hi - can anyone please help!

Yesterday I installed a new wireless network using a Netgear DG834N wireless router. I have a PC and a Powerbook G4 and new dual core MacBook connected. All is working fine in terms of general web browsing. However, Software Update cannot connect to download updates. Also, Itunes will not connect to the store (to authorise any of the computers - error (-1001).

I am connecting to the router via WEP
Encryption strength 64bit

These are my router settings

Firmware Version V1.01.06

ADSL Port
MAC Address 00:1B:2F:3D:FA:8B
IP Address 87.102.18.140
Network Type PPPoA
IP Subnet Mask 255.255.255.255
Gateway IP Address 87.102.18.254
Domain Name Server 212.50.160.100
213.249.130.100

LAN Port
MAC Address 00:1B:2F:3D:FA:8A
IP Address 192.168.0.1
DHCP On
IP Subnet Mask 255.255.255.0

Modem
ADSL Firmware Version A2pB021.d19e
Modem Status Connected
DownStream Connection Speed 2304 kbps
UpStream Connection Speed 288 kbps
VPI 1
VCI 50

Wireless Port
Name (SSID) Home
Region Europe
Channel AUTO
Wireless AP Enabled
Broadcast Name Enabled