AppleTalk is old, dated, and is being phased out by Apple. It wasn't even enabled by default in Mac OS X Tiger.
Yes, in the past (the distant past -- 13 years ago) we had a Windows NT 4.0 server which required "Services for Macintosh" to be enabled in order for Mac clients to be able to see the Windows shares. That was because the Macs did NOT have samba/SMB support, so that was the only way to do it.
Fast forward to now. Mac OS X, for years now, has had native samba/SMB support and can access Windows shares without the need to install anything on the Windows side.
In short, nothing at all needs to be installed on either the Windows computers nor the Mac computers in order for them to communicate. They have everything they need already, out-of-the-box, without having to install ExtremeZ-IP, AppleTalk, AppleShare, Services for Macintosh, DAVE, or any of the other 3rd-party Mac<->PC communication products. While some of those products may make it easier or perhaps offer more configuration options, they are, by no means, necessary in order for communication.
If you want to access Windows shares from the Mac, simply share a folder on the Windows computer, and then access it with command-k in the Finder on the Mac by entering "smb://[ip address of Windows machine]/[name of share]". If you want to access the Mac from the Windows computer, you must enable "Windows File Sharing" (for Tiger and earlier) or "File Sharing" then Options > "Share files and folders using SMB" (for Leopard). Then, do the same thing from the Windows side: open an explorer window, type "\\[ip address of Mac]\[share name]" and you should be good to go.