Acer extensa 5235 reset

I have an old acer extensa 5235 and I want to competely reset it. With it being a little old it didn't come with a disc to reset it. It won't turn on properly so I've done the acer eRecovery management. Once it starts to load it gets to about 40% then crashes and doesn't load anymore and then comes up saying error, or it will get up to 40% then go to the next bit where another loading bar will come up but that only loads up to around 2% then comes up with the error bar again, I've tried this several times and it still isn't working, is there any other way I could do it or get around it?