(adsbygoogle = window.adsbygoogle || []).push({}); Is there a way to load or add mods to mw2's steam version without using mw2 liberation if so could someone plz help me?

I'm asking because my norton say's its got bad files in it and it keeps deleting it and i dont want to disable norton because i don't really trust the program.

Thats why i was wondering if there's a alternative way of modding mw2 on steam.