It sounds like you have a few strange characters in your content. I would have them shot and quartered.
At a guess: You use a MSFT editor. MSFT have a proprietary character set that encodes character entities within a block reserved by the rest of the world for future use. These fall in the range of 128–159 inclusive. You need to save your work as plain text, not MS text, i.e. ASCII or ANSI. Otherwise you must declare your charset as windows-1252 (?) or whatever it's called. Best bet? Get a good editor. cheers, gary