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

MAC Address 00:1B:2F:3D:FA:8B
IP Address
Network Type PPPoA
IP Subnet Mask
Gateway IP Address
Domain Name Server

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

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

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