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What I'd do is, install one mod at a time and see what causes the crash. So use plain GTA, see if it crashes, then move up to LCPDFR, etc. That's how I had to do it.
There is actually a petition for Rockstar to release the PC version of GTA V. http://www.change.org/en-CA/petitions/rockstar-release-gta-v-on-pc
Rumours are pointing to a PC version as well. But who knows, it's Rockstar.