Re: Yes, that PC cleanup app you saw on TV at 3 a.m...
Take though that scary message "your disk is 1.27% fragmented". That actually means "is so unfragmented you needn't give it another thought", but it is presented as if it's a sign of impending disk apocalypse.
So, the motor mechanic equivalent would be one who's saying "your oil life is 1.27% used up, you need to replace it".