[CentOS] how to generate modprobe.conf

Hello, i have moved hard disk from one pc to another (some architecture). I
have booted, everything working. To my surprise some modules in
modprobes.conf are still there even if this PC does not have such hardware.
I have tried remove modprobe.conf, but after reboot, system by it self does
not generate a new one modprobe.conf. What is responsible for modprobe.conf
generation, how can i revoke it to generate a modprobe.conf such as is
generated after fresh install.

Thanks in advance!

David
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