Good free Emulators and ROMs?

[DeerBoarDude]

I'm looking into getting an emulator and some roms, but I'm scared that I'll get a shoddy one and get a virus that screws up my computer. Anyone know some reliable non-virus emulator and ROMs for it?

[Petie]

Sorry, but talk of illegal material can't be condoned here as we don't want to be held responsible for promoting it. I'm going to have to close this and ask that no further posts of this nature be made in the future.

Edit:
Additionally, this is the second time you've posted this thread after the first one was closed. As I said above, please refrain from requesting anything illegal here. While the emulators themselves are legal, the ROMs aren't and can't be discussed here.