how do i recover an auto save in 2.48? please help!!!!!!!!!!!!!!

i was modeling a dragon and insted of pressing number pad 7, i hit the 7 abouve the letters. my entire medel disapeard and i couldn’t get it back. (what did i do?) in 2.8 how do i recovor auto saves?

The numbers above the letter keys just select that layer number. Just select the original layers again from the 3dview header.
Layers wiki entry

thanks! i forgot to save though. how do i recovor it? i tryed recovor last sesion but it didn’t work.

File / Open, select the last saved blend