Installation nano

Hi!,
My computer isnt recognizing my arduino nano.
Could someone send me a tutorial to install it?pls

Arduino nano with chip CH340G.
OS = Windows 7 64 bits.

Pluged nano-->Unknown dispositive-->Downloaded and installed FTDI drivers-->USB Serial converted GOOD-->USB Port ERROR CODE 10: unable to initialize dispositive.

Red led on. Yellow led flashes each second aprox. Is my hardware damaged? Is a problem with the OS? Cable may be?

Please help to solve, I would trully be in your debt! Thanks.

install CH340 driver

Same problem here but with the nano r3 with FTDI chip. What to do now. Im running win 8.1 64 bit