EDIT:: You can get a Wireless USB port adapter at you local Comp USA, Radio Shack, Best Buy,, even Wal Mart.
I personally use the 3COM OfficeConnect USB for my home network pf PC's & MAC's, I have been using 3COM products for years and found them to be the most reliable, secure, robust products on the market. You don't have to have a network to use this wireless USB adapter. I am VERY security conscious - especially in my area - too many people scouting for wireless PC's to steal bandwith from.
Purchased a TrendNet from TigerDirect - it did not secure my network from malware 1/2 as well is the 3COM Wireless adapter does.
http://www.3com.com/products/en_US/detail.jsp?tab=features&pathtype=purchase&sku=3CRUSB20075
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LEMMEEE AAATTTIIMMM>>>>BANG< BANG>
But do you have an internal wireless ""NIC"" card installed in the upstairs PC?
How to...
http://www.coachconnect.net/support.html#2
If not, you need one to complete the setup. Or you can get a USB wireless port adapter to plug in.
How to...
http://www.coachconnect.net/support.html#2