probs with rss

Hi,
i seem to be having probs with the rss feed from my news articles.
It's very sensitive (?) and if theres an apostophy, comma, hyphen etc. it blocks the whole feed. the rss usually gives the first couple of words/ letters before the offending mark so you can correct it . however now i'm getting:
An invalid character was found in text content. Error processing resource 'http://www.twitchy.co.uk/integra/news_rss.php'.
any suggestions as to how to fix this so the rss isnt quite as 'picky'
i seem to be having probs with the rss feed from my news articles.
It's very sensitive (?) and if theres an apostophy, comma, hyphen etc. it blocks the whole feed. the rss usually gives the first couple of words/ letters before the offending mark so you can correct it . however now i'm getting:
An invalid character was found in text content. Error processing resource 'http://www.twitchy.co.uk/integra/news_rss.php'.
any suggestions as to how to fix this so the rss isnt quite as 'picky'