Spectrum Emulator
This is an excellent emulator run on windows, and the only one you will need. If you want a different emulator then goto the wonderful world of spectrum.
Simply download ZX32 by clicking on the link and then double click the icon. Then simply goto the file menu (top left) and select open, you can then open a game from your games folder (if that is where you choose to put them). You do not habe to unzip games in order to load them.
The ZX32 emulator also comes with some free games to get you started.
Happy gaming.