ok i have a dell inspiron 15-3521 purchased with the pre-installed windows 8 and its had Windows.7.Loader.eXtreme.Edition.v3.503-NAPALUM installed. so i want to find the OEM pruduct key and do what ever it takes to get windows 8 back. im pretty noob with computers but have done a little research so far. i have tried useing RW everything to find the OEM which in the SMBIOS [system enclosure or chassis] (type 3) OEM-defined 0x00000000 so im guessing from what ive read the BIOS has been replaced is there a way to restore the original windows 8. i have no back up either any help would be great ty