How to use selective startup to track down issue with video game?

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I have an issue with a video game where it spontaneously freezes mid-
play during multiplayer. This is an issue many people have experienced
with this particular game. Some of the fixes I've seen don't apply to
my system - i.e. Realtek audio drivers that people claimed were
conflicting with the game except I don't have Realtek drivers
installed.

One of the suggestions I got from tech support is to use selective
startup to see if anything is conflicting with the game, however how
does one do this? I know how to get into selective startup but how do
you utilize it to determine which if any process is causing the
problem?

Thanks