Dell Desktop Wireless Adapter

Vista Desktop running does not have network card installed wireless can not connect to wireless internet?

We have a router in the basement and my computer does not detect the wireless signal. I used to have to set in the basement, where I would like to connect to internet with ethernet cable, but now I'm set on the 2nd floor where there is no box for Ethernet. If I buy a USB wireless network? How much should I spend? What do you think of these adapters: http://www.newegg.com/Product/Product.aspx?Item=N82E16833340014 http://accessories.us.dell.com/sna/products/Networking_Enterprise_Class / productdetail.aspx? c = us & l = en & s = bsd & cs = 04 & sku = A2284380 Abstract # http://www.newegg.com/Product/Product.aspx?Item=N82E16833180017

USB Adapter R amzaon flights cost less than 15 pounds, but the charges on Amazon

Unboxing: Dynex USB Network Adapter