I don't need this any more as my new laptop has wireless built in.
This is like a USB memory stick that you plug into your pc or laptop and it adds wireless capability. I really liked this one, it never let me down or dropped the connection with my router, irrespective of where in the house I was.
It comes with an Installation Guide and a resource CD containing software and drivers for all Windows versions upto and including XP. I'm not sure whether Vista is supported, I bought this about three months before Vista was released.
Specs are; 54M Wireless LAN USB Adapter, 2.4GHz, 802.11g/b, WPA data security, TKIP/AES encryption, 64/128-bit WEP encryption, internal antenna
£5 delivered (direct bank transfer would be favourite) and I'll send it by Royal Mail recorded so you'll need someone at home to sign for it.