Where did you get Win7? Did you burn the DVD yourself? How?
Did you wipe the HD with Diskpart Clean Command?
Reset the BIOS to defaults: Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS
Set SATA controller to AHCI to try install.
If this fails, format an active partition following step 2.2 in SSD - HDD Optimize for Windows Reinstallation