I have a Macbook 1.1 early 2006 that I want to erase and reinstall 10.6.8

If you have the Snow Leopard disk, do a backup,  preferably 2 separate ones on 2 drives. Boot off the DVD and run Disk Utility Verify/Repair Disk and Repair Permissions until you get no errors.  Reformat the drive using Disk Utility/Erase Mac OS Extended (Journaled), then click the Option button and select GUID. Quit Disk Utility, then re-install the OS.

 When you reboot, use Setup Assistant to restore your data.

Use the combo update to save time in Software Update.

10.6.8 Combo Updater

App Store Update for OS X Snow Leopard

You can still buy Snow Leopard at the Apple Store. It ships on a DVD for$20.

You'll need to upgrade it from 10.6.3 as soon as it installs.