Windows 7 professional SP1 64bit is a supported platform for FMS 13. It is stated in the system requirements. Beyond that I can't help you as I run everything on an OS X platform. But my understanding is (open to correction) that FMS provides all the access rights and server services for it's own use.
I have attempted to install FileMaker Server 13 on Windows Foundation Server 2012. After installing, FMS simply does not work, which means there is a component of windows that FMS requires that is not that part of foundation, or foundation is configured in such a way that is not compatible with FMS.
If you do not want to pay the high cost of Windows Server I would recommend a Mac Mini. They work great as servers and will cost you about the same as the windows server software alone.
FileMaker want's a 'Standard Edition'. It's not very clear in the spec's/requirements since there is nothing mentioned about other versions - but AFAIK even R2 isn't supported
** Sorry for typing mistakes - but it's impossible to edit postings on iPad here