Where are you recording the vocals? Remember, that mic is going to pick up any noise, whether its the computer, a furnace, air rushing through a distant vent, etc. Surround yourself with blankets-- hang them from the ceiling so they are in back of the mic (no more than a foot back), and behind you (I'm assuming you're standing up, though you of course can sit--then throw the blankets over a clothes drying rack). If and when you record acoustic guitar, the blankets are a must. I use wool army blankets, doubled over. The other posts are correct--I use the same things you do (Xenyx), though I'm using a Behringer B-1, which I'm sure is noisier than the Rode. I've had good results, but up until I isolated myself (as much as that is possible), noise always ruined or comprimised the recording.
P.S.: Yeah, what MM said really is important: No EQ, or anything else . . . .