I installed on my laptop Windows 8.1 without SecureBoot. After that I installed Ubuntu 13.10 and created partion /boot/efi and now laptop starts only ubuntu. How can I change grub settings to choose what OS will be started Ubuntu or Windows?
There's no evidence of a Windows boot loader on your hard disk. I recommend you run a Windows recovery tool and tell it to re-install the Windows boot loader. Unfortunately, I can't be more precise about that because I'm not very familiar with the relevant tools. The result is likely to be that the computer will boot straight to Windows. You'll then need to open an Administrator Command Prompt window and type the following command:
This should set GRUB as the default boot loader. (If Secure Boot is active or if you think you might want to activate it, substitute