how to improve sound quality of recordings from sound card

the recording outcomes from my computer sound card isn’t as good or as loud as the audio source that I’m recording from.
theres a big difference between the sound of the audio im recording from and the recorded outcome.
are there some settings that would help fix this problem?
my computer is window 7

It would help if you told us what sound card you have and what your audio source is and how you connect it to your sound card…