System Crash Driver Conflict

I dont know what to do. I have tried everything I can
think of. I my system keeps crashing about 1 or 2 a
day. Sometime it is when I am playing games sometimes it
is when I am not even on the system. Sometimes the
system just locks up. I just installed windows xp pro
about a week ago and my system has crashed about 30 times
since then. Today I was looking in the device manager
and should that there were some yellow question marks. I
thought that solving this would solve my problem. I have
solved all the yellow question marks but my system is
still crashing and locking up. Tonight when I got home
from work I found that my computer crashed and rebooted.
I then proceded to loging in. When windows came up there
were three serious error crashes. All were driver
conflict. I dont know how to tell if witch driver it is
or how to start looking for it. Help Please (before this
ends up on the sidewalk from a tall building).