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C Program start with windows
Open regedit and navigate to HKEY_LOCAL_MACHINE&*92;Software&*92;Microsoft&*92;Windows&*92;CurrentVersion&*92;Run
Make a new string value there and put the full path to the EXE file of your program into the data part.
EDIT: The &*92; is supposed to be a backslash, but the HBH filters block it.
There is a screenshot here