What services windows 7 for domestic users are potentially unsafe that can be disabled without compromising the system, making it the safest and most difficult security breaches?
This is a very broad question to ask, but I would point you towards the Microsoft Security Compliance Manager (SCM).
From the article:
Looking at the operating system from this perspective is a far better option than deciding to simply shut down services willy-nilly. Windows 7 is complex with many dependencies, and just randomly stopping things without understanding the different possibilities is foolish.
I do not know for Windows 7, but on Win 2000 and Win XP I would disable the server service, the telnet service, the remote desktop.
It is important to make thse services permanently disabled rather than marking them as "manual" because an intruder would be able to start them having only user rights if they are not permanently disabled.