One thing before you read my response: I don't know your computing experience so this may sound a little overwhelming if this is new material for you. However, don't lose hope! Success means not only having good consistent access to one printer from every machine in your house (which is awesome), but you will also develop a much greater understanding for home networking issues which will save your butt again and again in the future. Believe me, there is no faster way to get a practical crash course in networking than to set up a printer on the network!
When you say "Separate access to each machine," do you mean that you would install the driver on each individual machine using the printer? If that is the case I am fairly sure the answer is yes, but I am not 100% positive. While that might sound like extra work, there are many positives associated with it. For example, networking the printer rather than sharing it via a computer will allow much more consistent access to it. Consider that, as is, if you ever turn off your Windows machine your Mac will not be able to print! A real pain in the butt even if it's an always-on machine, as eventually you have to restart for one update or another.
I'll look into your specific printer model a little later today, but your Windows machine not being wireless will actually not limit it from using a networked printer (as long as it is plugged into the network with Ethernet cable). Assuming that you are only running one home network you should be able to print to a networked printer from any machine on the network (once drivers are properly set up). You would simply set up your printer in a similar manner to hooking your laptop into the WiFi network, and it will become viewable to all machines on the network. Note that unless you ad-hoc (going directly from printer to computer without going through your access point/wireless router, a temporary solution at best in most environments) you will need to set up your printer to access your network just like any of your other devices, meaning locating the SSID and inserting your passwords. If you really want to pursue the shared option through Windows though this forum on Microsoft seems to suggest a solution specifically for sharing to a Mac computer.
Btw, your manual should start in on wireless networking around pg 16, with pg 24 showing specific layout examples. Here is a link to the manual if you don't have it. http://www.google.com/url?sa=t&source=web&cd=1&ved=0CF0QFjAA&url=http%3A%2F%2Fwww.lexmark.com%2Fpublications%2Fpdfs%2F2007%2F2420%2Fenglish%2Flxdquser.pdf&rct=j&q=LexMark%20Z2400%20wireless%20printer&ei=fWuVToKTCcaUtwfOyYD-Bg&usg=AFQjCNEQKQDZFHS2D1yEN9h7o768i-1OCg&sig2=Em-FY6n-g-ORt1VezogaFw&cad=rja