Solved Windows 7 Ultimate x64 gets stuck on the boot while installing

[TechActivate781]

Hi,

So, I have a PC with Windows 8.1 x64. I am trying to install Windows 7 Ultimate x64 (edit, its SP1) alongside 8.1 to dualboot it. My specs are:
It is a Lenovo G50-70 Laptop
Intel Core i7-4510U @ 2GHZ, 2 cores, and 4 logical processors
8GB DDR3 RAM
UEFI
Secure boot disabled
PNY CS900 480GB SSD.
I have applied the image (using Rufus) to a SanDisk 32GB USB on GPT (the drive is on GPT).
When I start the setup, Windows loads its files, and start the animation. Not long after, it freezes.
Is there any fix to this and does anyone know why it happened?

Thanks

 

[SIW2]

to turn csm on in bios, change os optimized defaults from win8 to win7 then load default settings save and exit.

laptops and netbooks :: lenovo g series laptops :: g50 70 notebook lenovo - Lenovo Support GB

 

[TechActivate781]

Thank you, this helped me to skip the bit where it would get stuck.
Thanks again

 

[SIW2]