Since you're running Vista if you want to try the Ghostscript autofiltering recipe the best I could suggest is trying to follow the workaround in the linked blog post for Windows 7. The roadblocks to RedMon working are the same in both OSes. (Another workaround that may work is force-enabling a full "Administrator" account, which apparently you can do "somehow", and use that to set up the RedMon redirector. Some Google searches mention something along those lines. I can't give any specifics because I've never had more than a brief exposure to desktop Windows beyond XP.)
What having DAVE gives you is the ability to skip the part about setting up UNIX LPR sharing. You still need to go through all the other steps of installing Ghostscript and binding it to a virtual LTP port. Then to use Windows sharing you'd set up a second "printer" *on the Windows box" using a generic Postscript driver pointed at the virtual port, and then you'd share that virtual printer via the normal Windows mechanisms. (Which is how I did it back in the day... the DOS clients were actually leveraging the networking portions of Microsoft Windows for Workgroups 3.11.)
Personally, I'd say if Vista gives you the option of UNIX LPR sharing then set it up anyway. (I have *no idea* if it does or not.) Then if you get any more classic Macs networked you can print directly from them without needing a copy of DAVE on each one.