blackend

i wan't to know how to get back my pc as it was before installing the osx?

hello i have tested the iso on a dual layer dvd,the pc doesn't boot at all on the dvd but i have a question:i used the iatkos ML2 and it didn't work couldn't find the problem i have a partition on my pc where i wonted to test first if it works,i formatted that partition once and then the pc wouldn't boot at all the question is if i won't to delete the osx from my pc what should i do?