Where did you get Windows 7? How do you plan to activate it?
I'd burn a DVD using ImgBurn at 4x speed.
Reset BIOS to defaults, set SATA controller to AHCI to try install.
Boot DVD, press Shift + F10 at first screen, in Command Line run Diskpart Clean Command
Close command box, click Install now to Clean Install Windows 7
. If installation fails, report back the step where it fails and exact error message verbatim.