I'm so sad I did such things, but about two weeks ago a got a new Lenovo u510 laptop. Of course that's not the problem :D. I wanted to dual-boot Ubuntu alongside Windows 8.
Everything was quite smooth, but later I wanted to change boot manager with EasyBCD. It didn't do what I expected, so I returned to default in EasyBCD. Now when I want to boot to Windows it says:
Windows failed to start. ... Status:"0xc0000098 Info: The boot configuration data file doesn't contain valid information for an operation system.
I found many answers what to do, how to fix it with Recovery DVD. BUT when I wanted to set boot to DVD, I opened BIOS boot options and under EFI there were two times "Ubuntu" and two times "Windows Boot Manager". But CD/DVD disappeared? That's the main problem I think.
I think it has something to do with partitioning.
Notice: I still have access to Ubuntu. So maybe I can fix this from Ubuntu? How can I return that CD/DVD option to BIOS EFI?