Dell factory restore no disk and no partition

inneedofhelp - May 28, 2016 at 01:53 PM

I have a Dell inspiron laptop that has windows 7 installed on it, I am trying to fix as it has had a lot of viruses on it I cannot restore it through the laptop by trying the F8 button at restart and the advanced system restore option it does not work so I assume there is no longer a partition image and my laptop didnt come with a CD so does anyone know anyway of how I can restore it to factory settings?