[Client] Crashing when on desktop (Warning(opcode 0x812): Exception 0xC0000005 at 0x571A00)

[JustMichael]

Okay, so straight up your thread's title makes no sense. Pawn is a language and can not *crash* (the Pawn Compiler can crash, but is irrelevant to the problem here).
(You are referring to the SA-MP Client, that has crashed)

So the crashing, could be many things.

Invalid Vehicle Mods,
Invalid Ped Skins,
Bad Mods,
etc

I'm going to have to write a detailed format for this kind of thing, because there is a lot of information you are not providing, like is this your server you are on, what mods do you have installed (including any .als files), what where you were doing before you alt-tabbed.