Hi PiyushMhatre, I am Paulo, an Independent Advisor willing to help.
Have you checked the startup folders if there's a shortcut of the app in there? If not, press Windows key + R then enter these locations. If there is, delete the shortcut
shell:startup
shell:common startup
If there's nothing there, it is possible that it is being opened by a scheduled task. You can open the Task Scheduler and look for Asus USB Charge Plus then disable it
https://winaero.com/enable-or-disable-scheduled...
(Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.)
Let me know if this helps.