|My question would be why wireless?|
Wireless is not a hi-tech alternative to wired. It is a hi-teck solution to a situation that requires portability. As this is a PC, portability doesn't appear to be a consideration.
You would be far better of with an Ethernet card and a wired connection. Far more reliable, faster and would not tax a 10 year old computer.
Ethernet cards are not expensive at all. However a lot depends on what network hardware you have, Modem, router, etc.