In a network system, connecting to your Windows PC from the Mac is a real easy process.
First you have to make sure that the folders you want to access are being shared from the Windows PC. On a PC, a folder can be shared by right clicking the icon, selecting the properties option and then the sharing tab.
If your Mac is connected to the network, then in the Finder menu, click ‘Go’ and then ‘Connect To Server’.
In the address bar, type in the name of the PC you want to connect to prefixing it by smb:// and then click connect.
You could connect to the PC either as a guest or as a user by entering the user name and password.
On clicking connect, a window will show you the list of available folders on the host computer.
You can also browse the available shared folders by selecting the PC name from the Shared option in a Finder window.