Well, I personally use Waves plug-ins for that.
However there is a bunch of noise reduction software out there. I recommend you search the net and try some demos. Just look for stand alone noise reduction programs.
BTW ONe thing to watch out for is the ones that cut out the high end frequencies. You don't want that happening.

I'll do some searching of my own, so I can be a bit more specific with my suggestions.

-ED-