I also got a 32-bit refurbished machine. It's clean of everything but Mach3. According to instructions, Win7 64-bit won't run the parallel port. So far I haven't found anything that won't run on Win 7 64-bit, but I've yet to hook up the router. There are some nuances to learn like the write macro only works if you have absolute coordinates in force. I thought that might be an OS issue, but deep in the manual there is a mention of the issue and you just need to figure out the right G-code to fix it. DXF input is in LazCam, for which the "manual" is, well, not exactly up for an excellence award. It's dissappointing that the Mach3 manual doesn't fully describe the software as it actually runs, but it's a shareware program as I understand it, so my expectations were limited and I'm generally pleased with it. It's a pain that DXF input won't do 3D. I have to code stuff a layer at a time and cut/paste the G-code for each layer. Learning as I go. Like Rich said ... I guess I have the option of finding more exensive options that do support 3D.