Now, if you're asking for a way to run a program when you log in, that's not hard at all. Even if anybody here has a way to do that, they're not going to tell you, not when they could get a big pile of cash for either telling MSFT about it, selling it on the black market, or using it to create malware themselves. Think about it: what you're asking for (change how the OS works, without being authorized to do that) amounts to 'I want to break the most visible security feature of the most widely used desktop operating system on the planet'. That situation pretty strictly supersedes Administrator access, but can be blocked by Bitlocker or other full-volume encryption (where TPM is used and you don't have the key), especially if Secure Boot is also enabled and can't be disabled. Nothing a non-admin can do will modify the OS boot process, unless the user has physical access to the machine and the ability to modify the boot disk offline.
