My computer was running 10.6.8. I am repurposing it and did a factory reinstall. It is now at 10.5.8. I would like to upgrade this to at least 10.6.8 but I am happy to go up higher if it can take it. Is there a free way or least expensive way to go up. What could I go up to and how. It is 2.8 Intecl Core 2 Duo Memory 2GB. Thanks!