If you want to see where the Comet ISON, is in relation to the Earth at this time, see here:
Only then will understand why the Comet still does not see and when you get to see him. The ISON trajectory is currently behind the Sun, a few million kilometers. The comet is passing close to Jupiter and Mars. Jupiter is aligned with the Sun relative to the Earth at this time. so it is very difficult with the sunlight, see the Comet ISON.