another option is to download a proxy server software, like wingate, um, some others but wingate is fine. I used to mess with it, when you install it it gives you the option to install server or client. you just install the server thing on the old computer and client on the new computer. I don't know if wingate is free or not... but you can get one for free here:
http://www.52sy.com/SoftDown.asp?ID=1259
I hope it's in English...