No sharing because no network card?

[Karol]

I have a Fujitsu Lifebook U series which has no RJ-45 port, i use a USB adapter.

I can't share this computer although i enabled file sharing. it sees the other computers in my home and i see only the public folders in it from other computers.

In the Network adapters list in Device Manager there is a Wirelss card and 8 WAN adapters, each with a different protocol, i guess.

Do i have to install a network adapter in a vacant PCI slot? where do i buy these?