Okay.
On a windows computer, the wireless area for Vista and up should have a make into wireless access point. Or hot spot. Connect BB and tether. Turn on the wireless sharing.
I'm not too sure if you can do this because the tether may only work if the wifi is turned off.
Look up 'make laptop into a wireless hotspot'.
Google it.
Wikihow.
Or something.
So... I tried doing this with an LAN cord.
A LONG time ago.
I wasted about 8 hours of research and experimentation. It never ended up working.
So don't do unless you have a LOT of time
Posted from my CrackBerry at wapforums.crackberry.com
if you have tether berry and windows 7 download a free program called Connectify...it turns your laptop/PC into a wifi hotspot and thus letting you use your itouch or whatever else you got...i use it and it works perfect