Why to spend money when you can simply use Ubuntu? it isn't really hard to use, it's free and you can boot it from a Virtual Machine.I just went reading up a bit and seen so many people waste their time with the Windows method that (and I have said it before, many times now ) people are better off buying a cheap router (approximately €/$20,- is enough for a compatible router) and do it that way. You will not be disappointed (installing DD-WRT and the script only takes about 5 minutes) and you do not need to mess up your Windows configuration.
I can drop in here and say that I tried everything before going the DD-WRT route.. several Windows methods and different Windows versions (8, 7, XP), Ubuntu/Windows VMs, booting straight to Ubuntu off external devices, etc. Some (most?) USB dongles just will not work properly and won't change the MAC on the fly without an unplug/replug or reboot, and even those that have chipsets that are confirmed to work don't always work as expected. They didn't for me, across several different pieces of hardware and several different machines. The only thing that worked for me was using DD-WRT, and it worked right off the bat (once I flashed the correct DD-WRT build), and works perfectly. I spent weeks of time and headache trying to get the other methods to work. What's worth more: several, several hours of headache and your time wasted, or $40 for it to work right away? I can definitely vouch for going the DD-WRT route.