is there a way to....

[s44678]

use a desktop computer like a network hub?

Basically the PC upstairs is connected to the wireless router downstairs. Is there a way to connect another computer (that only has an ethernet card) to this PC so it can use the internet as well?

[T1z3R]

google internet connection sharing (ICS).
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duck my sick!

[tofu-wtf]

stick another network card into it and bridge them.

Alternatively use a wireless bridge (most wireless routers can be set up as a bridge but check before you buy typical price about £25 but you can go cheaper https://www.ebuyer.com/product/132431 ) Wireles bridge connects to wireless network and router functions as a hub (you'll need to turn off the DHCP server in the bridge) typically with 4 ports, so you can plug in a pc, xbox360 bla bla bla.

Happy networking
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Eagles may soar.............but rats don't get sucked through jet engines!!
1999 ZX6r G1.....it makes me smile