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#281
Where did you get Win7? Did you burn the DVD yourself?
Confirm your BIOS is UEFI. Look in BIOS Boot order to see if there is an EFI Boot Disk. If so, remove it from boot order and try install.
If that fails run Diskpart Clean Command followed by the command convert mbr to make sure you don't have a GPT disk.
If that fails, remove all but 2gb of RAM to try install. Test your RAM - Test with Memtest86+. Swap RAM sticks, making sure no debris is in slots.
Next test your HD using maker's HD Diagnostic extended CD scan followed by Disk Check run from installer's Command Line accessed by pressing Shift + F10 at first screen. Format a full disk partition,, then mark it Active following Step 2.2 in SSD - HDD Optimize for Windows Reinstallation in order to run Disk Check and then try install again.
Report back as there are more steps depending upon results.