Hopeless Win7 Installation Problem

Hello,

I am trying to install windows 7 on my new laptop DELL INS 5559. I created a USB Boot via Rufus and also a DVD with Windows ISO Burner.

Problem is 3 phased :

If I just use USB stick :

Then it gives "A required CD/DVD drive device driver is missing" error. I have tried unplug and plug many times with different styles, not worked.

If I just use DVD :

I can't boot with it, after power on it gives "boot failed, press a key to restart" error.

If I use both of them :

I boot via USB which is fine and I come to install screen, I choose Windows 7 version and at hard-disk partition choosing it gives "Setup was unable to create a new system partition" error in both partitions. One is 300GB System Type, other is 630GB Primary type.

Another crazy thing :

I can just use diskpart in welcome install screen, not in partition select screen.
https://www.youtube.com/watch?v=f2bZkKbW7BM
I did same thing in above, when I restart it gave BOOTMGR missing error, I try to diskpart again and my partition was lost! 959GB Disk but 0B free!

I can supply any screenshot you want, just please help me get over this problem. It has been 2 days now, I searched all around the net but didn't find anything at all.

I most probably already tried anykind of stuff, but I will try again and report you everything.

BIOS is on Legacy and AHCI.