I want to reinstall just OS 10.6.8 on my MacBook Pro without erasing existing files/software/etc. Is it possible to do this and if yes - how exactly? (I’m not a techie and feel a bit uneasy to do clean reinstall even having full backup of the HD) I do have original OS 10.6.8 CD ready. This laptop model is one with built-in disk drive. A detailed description how such reinstall is done will be much appreciated! Thank you all!