Getting nervous! answer quick! PLZ

[Pokeventurer]

so guys i a freaking out right now, i just clicked on an pop-up add accidentally and it downloaded a file on my computer automatically (most probably a virus) by something known as a drive-by (uncontrolled/automated) download. i never touched the file and deleted it on spot as soon as i saw, it was created about two minutes early when deleted from my computer. now do i need to worry about my computer or will it be fine.
Any help is appreciated!