i put the HDD in the main bay and i have the same problem ( Windows could not update........................Installation cannot proceed)

Did you put back the Optical drive back in Optibay?

the position of the optical drive is empty and i have only HDD connected in the main bay

Can you re-install the Optical drive for the duration of the Windows installation?

Maybe i can borrow from my friend because mine is broken .

I have also a mac mini Late 2012 . Is it possible to replace the hdd there, in witch i want to install windows, and then put it back on my macbook pro ?

Yes. After you remove the disk from MacMini, because it has different Apple hardware compared to your Mac, you will need to be careful with drivers. If you can avoid installing BC drivers for the Mini on Windows, it would easier to move Windows from the Mini to you machine.

This mean that i would make the whole process over again or i can use the same bootable usb that i have now ?

To Avoid installing mini drivers ,you mean these three files i have already downloaded from macbook pro ( $WinPEDriver$ , AutoUnattend.xml , BootCamp) ,right ?

These files help BC install drivers silently when Windows is installed. Unless you are willing to modify these, you will need to let it complete on the Mini. Once Windows is up and running on the Mini, carefully remove drivers which are Apple-specific. USB, Mouse and Keyboard drivers should be left as they are. You should remove the Bluetooth and Wireless and Wired Network drivers.

Sorry if I becοme importunate but how i can remove these drivers (USB,Bluetooth ,Wireless and Wired Network) or it easiest to remove it from the 3 files ( $WinPEDriver$ , AutoUnattend.xml , BootCamp) ? Exist tutorial for that purpose ?

Let them be fully installed on the Windows on Mini. In Device Manager, right click on Bluetooth, and Uninstall Driver. Repeat the same for Wireless and Wired Network adapters.

I made a full install in the mini and uninstall the Bluetooth ,Wired Network adapters ,wireless driver as you say (but i am not sure if i did it correct) .After that ,put my HDD back in macbook pro and now i have some issue with : Bluetooth ,sound ,the first line of the keyboard and after all when i run Win8.1 the screen of the macbook  goes black after a few minute without i can handle my mac

Did you Boot Camp: Install or repair Boot Camp drivers using the BC drivers for the Macbook Pro?

No

To do this i should download the latest apple software update  (that contains the link above) Win?

Use System requirements to install Windows on your Mac via Boot Camp - Apple Support to find the correct drivers for your MBP and download them to a USB2 device then use the Repair link.

Sorry ,i couldn't understand you before properly (i was out) .I have made this step at first  in the mini.

And now when goes to run Win the black screen appears in the boot windows logo

HELP!