I had a partition with Windows 8 Release Preview, Windows' System Reserved partition and the empty space of the beginning of disk. I moved two partitions to the beginning of disk using Ubuntu Live CD and GParted.

After that, the Windows Loader didn't boot and throw an error about missing files. I fixed it using the commands:

bootsect /nt60 sys /force /mbr
bootrec /rebuildbcd
bootrec /fixboot
bootrec /fixmbr

When I used "Automatic repair" option from "Advanced boot" menu, it throw an error like:

Windows can't fix your boot problems. For more information see file C:\Windows\System32\LogFiles\Srt\SrtTrail.txt

In this file I found a description of the system repair actions and at the end of file:

Boot status indicates that the OS booted successfully.

Now, when I use the Advanced boot menu from Windows 8 (PC settings -> General -> Advanced startup) I receive an error:

Restart your PC to try again. It looks like something didn't load correctly. Restarting might fix the problem. If this happens more than once, you might also be able to find help by searching online for the specific error code. Erorr code: 0x8007090.

0x80070490 is the error code ERROR_NOT_FOUND.

What are the missing boot files and how can I restore them?

List of files in System Reserved Partition:

B:\bootmgr
B:\BOOTNXT
B:\Boot\BCD
B:\Boot\BCD.LOG
B:\Boot\BCD.LOG1
B:\Boot\BCD.LOG2
B:\Boot\BOOTSTAT.DAT
B:\Boot\Fonts
B:\Boot\memtest.exe
B:\Boot\qps-ploc
B:\Boot\Resources
B:\Boot\Resources\bootres.dll

and many *.mui and *.ttf files.