Cheat Engine

[Stacktrace]

Hey, I'm wondering how I can change multiple registers through Auto Assemble, pretty much like you do with a debugger and change registers.

This does not work, it crashes the game. Is this a really stupid question or..?

newmem:
mov ecx,1
mov eax,1

[Zanzer]

That is how you change registers, yes.
The question is, do you really want to be changing those registers.
If the game's using EAX as a pointer and you change it to '1', of course it'll crash.

[ParkourPenguin]

Posting the ASM around your injection point would help give us some clue as to why that crashes the process.