No need to uninstall any of them, just use the one you want.
Windows Media Player comes as part of Windows Op Sys
Quicktime is the Apple format player
Cyberlink powerdvd player probably came with your pc's dvd
NTI - never heard of it....
I have several players installed but usually use the free VLC player from videolan.org/vlc that I downloaded and installed as it can play almost anything.