Hi -
Installing SharePoint on a machine that isn't running a server OS is tricky, I think. And installing SharePoint for all your form users individually - well, it would probably make more sense to just upgrade their Office installs to include InfoPath.
I'm not sure what your budget is, and I don't have much knowledge on the cost of different options, but have you considered Office 365? I'm not sure which options include InfoPath Forms Services, but that's what you'll need for browser forms. Good luck!