The code for connecting to a Windows 2000 Pro machine (I don't know about XP yet, but it SHOULD work) is as follows:
smb://<network domain name> (usually something like "workgroup");<username>(as specified in "Users & Groups" under Windows - NOT Mac OSX's "Users"!)@<name of PC you are connected to> (see ID tab under "system" panel)/<name of shared drive>
So for example, to connect to my PC's MP3 partition I have used the following code:
"server" is the name of my Windows 2000 PC. In "Users and Groups" I specified that "alexis15" would want specific access to my F drive (the MP3 drive). I created a new share in "My computers" and allowed "alexis15" to access that drive. Creating a share allows you to give a name to your F drive (e.g "MP3s").
You will then me prompted to enter the password you specified in "Users and Groups". For my backup drive (a renamed E Drive), the code is therefore as follows:
Again, you will be prompted to enter your password to access that drive.
Any questions, let us know.