Can't install windows 7 (Windows cannot be installed to disk)

All data on internal harddisk may be deleted?

Command Prompt at Startup option ONE. So enter "command prompt". In command prompt:

Code:

diskpart
list  disk
exit

What drive number is your internal disk (look at the size in the output)?

Megapac said:

Hello everyone I have an issue downgrading from windows 8 to windows 7

My laptop doesn't have dvd-rom so I'm installing from USB stick.
I put windows 7 files following this tutorial USB Windows 7 Installation Key Drive - Create

Then I went to UEFI and disabled boot secure. After I enter installation it doesn't let me choose disk where to install windows files. It says Windows cannot be installed to disk...



I have formatted partition 4 so I'm not able to boot windows 8 now...
Any suggestions?

Partition 1-3: very small... not really important for win7 and data.
Partition 4: allready formatted... so no data anymore.
Partition 5: Recover stuff. I think for going to "factory install". Read manual and try "restore factory settings" . Works? If it doesn't work... no important data is on internal disk anymore, am I right?

Megapac said:

Disk 0 - 698 GB (HDD)
Disk 1 - 14 GB (USB Flash)

If internal harddisk may be cleaned totally (ALL DATA is gone afterwards!):
Boot again to "command prompt" as explained before.

Code:

diskpart
select  disk  0
clean
convert  mbr
exit

Does that work?

Megapac said:

diskpart
select disk 0
clean
convert mbr
exit

Did this,now it says Setup was unable to create a new system partition or locate an existing system partition.

Did clean succeed succesfully?
did convert mbr succeed successfully?