Sorry again not a vb question!

I have a Router and Wireless LAN(WLAN)

1 x PC connected via Cable to WLAN
1 x Laptop connected Via NETGEAR Wireless Card

2 x PC's With IEEE 802.11g 54Mbps Wireless Lan PCI Adapter cards

Trying and failing badly at connecting these to New PC to WLAN

My laptop is picking up My ArcorWirelessLAN and nothing else and works fine

2 x PC's are picking up 4 other networks but not My ArcorWirelessLAN

Why?

Note: Didn't set the origonal PC and Laptop a German Engineer did as it was all in German!

Thx