test it like before.burn the files split into rar/zip files then extract them on a friend's pc & install there.if it works on your friend's pc then it means problem is not with source files but with extracted files which may be due to bad hdd/bad ram.if you have a 8/16gb pendrive try extracting files from dvd to that & then run install to see if it works.if it does then that means problem is with hdd/some software interfering with hdd.btw you mentioned no AV so just for the sake of it download & scan your pc with kaspersky rescue boot cd just to be sure.