What about Box from Logan's Run (most of you are probably too young for that movie, I know):
Box
Some other good old robots are Twiki from Buck Rogers of the 25th Century, and Bishop from Aliens, Hal 9000 from 2001: A Space Odyssey, Maria from Metropolis (1927) and Gort from The Day the Earth Stood Still. And so many more!
MissInformation
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"I am incapable of making an error." -HAL