For not so computer literates I always would recommend Ubuntu or something like that, the only problem that they will have (at least I always have) is to upgrad

For not so computer literates I always would recommend Ubuntu or something like that, the only problem that they will have (at least I always have) is to upgrade to newer versions, for someone that is not a übergeek this is a nonissue and a LTS release will be just fine for some time.