As i was saying to the other guy if you have modified your windows previously with say < HAZARS bootloader or anything that modifies windows bootloader then you will need to remove it completely, By useing the Bootsect.exe command to replace win7`s original bootloader. also use Everest to check your current SLIC, it should show all of them saying DELL like mine does in the first post of this thread picture. If you use any type of loader it will emulate a HP cert and thats no good.. get back to me.
The best wrong thing - you won't be able to flash modified bios The average wrong thing - windows won't activate The worst wrong thing - your computer won't boot anymore