The forums looked cleaned out of the older posts, Here is how I used to do it on my ibook to windows XP

step 1 set up filesharing on the PC and make sure the firewall is turned off, at least till you get it working. Share a folder

step 2 type this in the dialog box in connect to server in the finder, replacing the names of course to what is setup on your windows box.

smb://computername/sharedfoldername

I think sometimes you have to type in the "workgroup" as well.

smb://worgroupname;computername/sharedfoldername

This is by memory so forgive me if I have it slighty incorrect. 10.2 allows you to just search for the PC on the network.