24bit to 16bit conversion problems

am recording analog to computer at 24bit.
am picking up artifacts from my conversion to 16bit.
using sound forge to record and convert.
my question is: is it possible to do this without noise, or am i better off just recording at 16bit?

If you’re not going to do any processing on the files (i.e. you’re just recording them, then encoding them to MP3), then don’t bother with 24 bit.