The older threads are always available once they have been posted which is why the dates of the postings are important. The OP/Original Poster may have found a fix for a problem or junked/replaced the computer or moved on to other things or places. The OP may never visit again after all that, we don't know.
As far as finding older threads a Search for a term may find a number of postings. And then there's the Unanswered Threads in the links at the top.