[Networking Help Required!]

Basically, we have a home network which is wireless.

I've been given my brothers old laptop which is XP, which enabled me to do particular things such as DJ using skype on it (As my PC which is Vista i cannot do this)

When i try to connect to the network it connects, but says Validating Identity all the time, and then Windows was unable to find a certificate to log you on to the network and doesnt allow me to visit web pages or sign into MSN.

You'll laugh at this - I tried connecting a USB/Ethernet Cable Through my VISTA pc to the XP computer hoping that mabey something would happen. lol well nothing did..

Can you find a solution? If theres no solutions for connecting to the wireless network, how do i go about trying to connect my vista pc to my xp pc so i can get the internet onto the XP computer? If theres a way.

+rep. Thanks