Thanks to everyone who answered to my message for help. Problem caused from the second Hard Disk, partitions of which were marked as Primary, left out after beeing moved from primary to secondary...

Forgot to mention either that I have changed the boot order many times between primery hd (ssd), cdrom (hd), usb etc in any order, but it didn't help.

Here is the partion screenshot requested. Language is local, but I think you can get the idea.

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I recently upgraded a Toshiba A300 laptop (2009 model) from Win7 to Win10. I use a 125GB Kingston SSD as primary and a 280GB Hitachi as a secondary internal hard disk, in place of DVD drive, inside a...