I think there is almost no difference between windows7 users and other windows OS.
with default configuration, you need to set the WAN and wireless LAN on the device.
As you mentioned, the desktop can surf internet, but the laptop can't.
Can your laotop connect to the NBG334W via wireless? if yes, check next. If no, check if the wireless LAN disabled.
Can it get an IP arranged by the router? If no, you should check if the DHCP server is enable on the router.
BTW, the NBG334W should in router mode, right?