That error can happen when the .exe needs to read a config or system file. You might be missing essential files the plutonium-bootstrapper-win32.exe needs in order to run.
Windows cannot access the file for one of the following reasons: It could be there is a problem with the network connection, the disk that the file is stored on, or the storage drivers installed on the computer; or the disk is missing.
I would suggest you delete everything inside "C:\Users\You\AppData\Local\Plutonium"
Delete your plutonium.exe and download a clean one from https://plutonium.pw/docs/install/
Run it as admin and let it download all the files/dependencies again.
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