Backed up all files, erased disk (partition) reinstalled OS that came with machine (snow leopard - was informed that that was the OS that came with the machine originally and that one had to be installed). Default apps installed.
Tried to reinstall from TMBackup, told OS needed to be updated as apps wouldn't run on OS just reinstalled. Updated to El Capitan and tried to reinstall all apps and data.
Data transferred ok, but no apps, not even default ones, were installed. Can't even connect to Internet to replace anything.
What happened? How can i fix it?