Windows 10: My Windows 10 advanced startup doesn't show the regular options

A quick introduction: I'm in the midst of trying to convert my BIOS from Legacy to UEFI. Every time I'm about to solve some problem (converting from MBR to GPT, running commands in cmd, etc.), some new error occurs which compels me to keep searching for solutions on the web. One of the things I did was deleting files and folders that were told to be safe for deleting (pagefile.sys, the temp folder, etc.), but I restored them all once I realized it might cause other problems. I also deleted the recovery partition. Also, my D drive was deleted in the process of all this, which I don't know how or when did it happen.


Anyway, I'm now trying to access the "Advanced options" in the Advanced startup. As we all know, the "Restart now"button leads to "Troubleshoot", which leads to "Advanced options", which leads to five or six options. Here's how it supposed to look:





But in my case, "Troubleshoot" leads to a screen named "Advanced options" which has only a "Startup Settings" option, which leads to a list of functions the computer offers me to do. This is how it looks:





It seems strange to me (not to mention frustrating), because only recently it worked fine - it showed the options that are depicted in the first image. So I assume that whatever caused this bizarre change, happened when I messed with computer's settings.


How do I restore it to its previous state?

Thank you so much

:)

 

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I have not tried this, but this link may help you get back to a regular startup. Step 5 in Option 3.

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windows 10 no advanced-startup-options, so no startup settings


when i did 1. 2. 3. steps i checked and problem was SOLVED
but after 4. 5. 6. 7. steps i checked and no advanced startup options again

1. Make a complete backup image of your current HD including all partitions to an external HD using macrium reflect . Once done, disconnect all USB devices from the PC. Assuming now you only have one HD connected to the PC which you will be installing Windows.
   IMPORTANT: Also create a Macrium Rescue disk to boot from later on.
2. Boot up your Windows installation USB/DVD. On the first screen, Hold SHIFT + F10 to open Command Windows then type:
   Diskpart
   select disk 0
   clean
   exit
3. Click Next, Choose Custom, select the unallocated partition then click Next (Do not format), when asked for Product ID key, click on "Skip this step"/"Do it later". Continue the Installation.
4. Once done. With the external HD connected, Reboot your PC with the Macrium Rescue disk, select the image that you created in step 1 as the Source.
5. Select your current HD/SSD as Destination disk
6. Restore only C: Drive to it. ie. overwrite the new C: Drive with your backup C: Drive.
   NOTE: See screen shot on how to perform this step
7. Disconnect all the external devices. Reboot. Windows should perform a startup repair.

till 4. step there was no windows 10 key activeted and problem vas solved
but after step 7 i checked key and it was not the same which i purchased, why did that change? i activated purchased key again.
so is the problem to be a windows 10 key on my pc?
or do some drivers prevent advancedstartup options?