If you need to access a directory which is on a Windows host from a *nix based guest, you'll be using samba. Read up on the documentation for your particular distribution. After samba is installed you'd usually just run 'man samba'.
If you're using a gui (nautilus for example) and samba is installed, you'll want to edit the current directory path (default for nautilus is Ctrl+L) and type smb://hostname/path/to/shared/directory, smb:// tells the file browser to use the sambaSMB protocol and from there the hardest part is ensuring the path is correct. You will be prompted for credentials and assuming you have permission to access the data you can use the file browser as you normally would for a local directory.
Note: In my experience, not all samba implementations play nice with MS DFS network shares, so depending on your setup, mileage may vary.