Wiping the disk did not do anything for me. The problem is what windows has done in 8 that is not compatible with 7. The UEFI is the major problem. The way I found that fixed it was this:
Put your windows 7 disk in the drive
At first installer screen Press Shift + F10 to open a Command Box, type:
SEL DIS 0 (after confirming Windows 7 target HD #)
CREATE PARTITION PRIMARY SIZE=102400 (for 100gb partition, adjust as desired)
Then I could continue installing windows 7 and have had no issues. Working great!