Can't install windows 7 on Toshiba C660 in ahci mode

As the title says I just can't install 7 on it, I've tried compatibility mode and it just get's stuck half way and stays that way. I'm fixing this for a friend and have never come across this before. I've taken out the hard drive and checked it on my PC and the drive seems fine as I checked it with crystal disk, I formatted it and still the same results. Any ideas would be helpful. I might try Xp and see will it install that.

Hi Themorus,
My660 settings
BIOS ver 1.80
execute bit Available
VT VT-x only

usb legacy enabled/ sata contoller ahci.

havan't listed the rest as there self evident.

Roy

I found out what was wrong, I presume the sata connection on the hard drive is faulty, I tried another hard drive and it installed perfectly on it. Even though the hard drive shows up on another PC as a storage device and can be used as that. I should have thought of it sooner to try another hard drive.