Backup your drivers to an External Flash Drive or DVD, using Samsung Recovery Solution. (Bear in mind that you don't have any network connection after a clean install and neither a backup partition at your pc)
Make sure your BIOS are set to boot from DVD or USB Drive, by changing priority. If you choose to use a USB, you have to disable "Fast BIOS Boot" as well.
In case of using a bootable USB for the installation, a message might emerge, implying that drivers are not installed and cannot proceed further. Just click "Cancel". Then, you will be brought back to the welcome screen. At that moment, remove the USB drive and plug it back in, to a different USB port this time. Click "Install Now" again. The installation should proceed as usual.
Installing Windows
Insert the istallation media on your laptop.
At the Windows Setup Wizard, select "Custom Install" to view all disks.
At the "Advanced" option, choose to format all disks and delete the SSD.
Press "Shift+F10" to launch cmd. Otherwise, reboot into the Windows Setup wizard and choose the "Repair" option, in the bottom left corner, and in the tools menu choose cmd.
Type in diskpart to get into the partition tool.
Use the commands list disk and list part to determine which disk is what (check size parameters). For me, Disk 0 was the HDD and Disk 1 was the SSD. The following instructions assume this.
Select the HDD: sel disk 0
Delete all partitions on it: clean
Create a 100MB partition for Windows 7 (or 350MB for Windows 8): create part primary size=100 (or size=350)
Format it: format fs=ntfs quick
Assign it a letter: assign letter=f (if F: is in use, pick another one. Use the list vol command to see all volumes and their letters)
Create a partition that fills the rest of the disk: create part primary
Format the large partition: format fs=ntfs quick
Assign it the letter C: assign letter=c
Exit both Diskpart and cmd.
Reboot back to Windows Setup Wizard to install Windows into the large partition that was just created. !!CAUTION!! When Windows restarts your machine to complete the installation, do NOT change priority at the BIOS menu as usual, but instead boot from the installation media, once more, and choose the "Custom Install" option.
There is a great chance that Windows installed its System Reserved partition on the SSD, so choose the "Advanced" option and delete the SSD. Launch cmd (Shift+F10) and type diskpart.
Use the commands list vol and assign to ensure that both the system (F:) and the boot partition (C:) still have drive letters.
Select the system partition (sel vol f) and mark it as active: active
Exit diskpart and at cmd type the command: bcdboot c:\windows /s f:
Reboot and you're good to go.
After the installation
The easiest way to have Samsung's Easy Settings and ExpressCache installed to your machine is through the backup created by Samsung Recovery Solution, since you don't have an internet connection after the clean install. (Even when you get to have one, do not connect during this proccess (because of Windows Update interference) and wait till it finishes)
Browse the DVD or External USB Drive to find the "SystemSoftware" file and launch the "SecSWMgrGuide.exe".
Install "Easy Software Manager".
Install everything from the "Drivers" tab.
From the "Miscellaneous" tab, install "Windows 7 SP1 Critical Updates" and "Windows 7 SP1 common patches".
From the "Utility" tab, install "Easy Settings" and ExpressCache".
Finally, choose any other software you might need.
