I have no "proof of reality" to offer you (Plato had similar thoughts with his "shadows in a cave" analogy), but in all cases I have heard of pursuing these hypotheticals too far simply feeds neuroses rather than uncovering the Illuminati. The current US paroxysms of conservative conspiracy theories are IMO the product of failing to rein in such unproductive thought... do you really want to go down this road?
Your 26th century bit reminds me of the Continuum tv series. Entertaining story, but not likely to be worth building your reality on.
Just because you have OS install media and hardware does not mean the hardware functions. In fact, old hardware often fails MEMTST.