At work there are over 30 PC, some of them are Windows Vista Home and Windows 7 Home.

I just realized Windows Server is not worth it because it require to connect "Domain" on the clients PC. Windows Home does not support that and it will be very expensive buy licences for Professional or Business windows.

I am looking for alternative to Windows Server, something basic that I can block the desktop, some software, USB devices, and limit access to the websites. 

Thanks!