And then the Windows failed - and then I could not see to see -
The phrase "The Windows failed" is figurative. Windows can represent the soul or eyes, and their failure implies that life has come to an end. "I could not see to see," the last line, is incredibly vague. The speaker doesn't receive clarity or revelation at the time of death, which suggests spiritual or existential confusion in addition to literal blindness or the speaker's loss of consciousness.