What version of Premiere Elements are you using and on what computer operating system is it running?
Classically USB microphones do not work with Premiere Elements (any version) for use with its Narration Tool. Have you found otherwise?
Where is the noise - in narration clips produced by the Narration Tool or from imported audio files added to numbered Audio Tracks and/or soundtrack?
From what you wrote, it appears that the audio noises are confined to the narration being produced with your microphone and Premiere Elements Narration Tool. Is that correct?
Under fx Effects there are audio effects that you can explore to reduce noise. See Reference Effects Adobe document for a description of the fx Effects audio effects.
If you use the same microphone and create your narration in Audacity and import that narration into a Premiere Elements project, do you get noise in your narration?
Besides making sure that your microphone is compatible with Premiere Elements, have you evaluated your narration recording techniques...how close are you to the microphone, room noise level while recording, etc.
Please review and consider, and then we can decide what next.