Writing to system registry

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I'm working on a project where I need to write to the system registry in windows and I can't seem to get it to work. I am running as an admin and all my return codes are 0 meaning nothing fails.

And after I run it I check the entire system registry for everything. I have also tried compiling for both 32 bit and 64 bit.

The error path is the same as the success path. How do you know all the calls are succeeding?
I would add error-specific path's that log what GetLastError() returns.

gg

My return codes are always S_OK (0).