I have a blackberry curve 8320, I need step by step instructions on how to use my blackberry as a modem. My ISP will not provide any password or name needed to do this. I have Windows Vista on my laptop.
Please read the FAQ and do a search. There is an article in the FAQ that explains how to do it.
Also, make sure your carrier doesn't require an add-on plan for tethering (an unlimited data plan doesn't necessarily cover tethering). Some do, some don't. Otherwise, you could end up with an extremely high data bill.