So, the story started with permissions I changed in the registry and by adding 'Everyone' to the key, it simply deleted every user instead and also the owner. The computer hasn't booted until then (black screen with a cursor). I used WINDOWS 7 Recovery CD to repair it.
I've been successful in applying permissions back, thanks to this post: http://www.sysnative.com/forums/windows-7-|-windows-vista-tutorials/3902-fix-permissions-changes-preventing-windows-from-booting-windows-7-windows-vista.html
But now my system still won't boot. I get black screen with movable mouse cursor. Safe mode, last known good configuration and system restore all don't work. I tried almost every combination in diskpart, however, still no luck. Here's the info for the one who is more experienced than I am and would be kind enough to help me.
Diskpart shows 1 disk, when I select it, it is divided into three partitions.
The first one is: Volume 1, Letter C, Label=system, fs=ntfs, primary partition, 500 MB and healthy
The second one is: Volume 3, Letter E, Label=recovery, fs=ntfs, recovery partition, 6000 MB, healthy and hidden
The third one is: Volume 2, Letter D, Label=OS, fs=ntfs, primary partition, 925 GB, healthy
According to this tutorial How To Rebuild the BCD in Windows I had been able to get 'Total identified Windows installations =(1)' if I chose D. So I assume Windows is installed on D:. I may be wrong. When the computer worked, I did not see any D: disk in My Computer (only C: with OS).
The problem is, I cannot choose which of the following partitions I should make active so the black screen wouldn't appear.
When I enter in cmd:
vol C: -> Volume in drive C is system
vol D: -> Volume in drive D is OS
vol E: -> Could not find the following drive. Error while processing. Volume in drive E is recovery.
vol X: -> Could not find the following drive. Error while processing. Volume in drive X is boot.
vol F: -> Could not find the following drive. Error while processing. Volume in drive F is GRMCHPXFREO_EN_DVD
When I enter in cmd:
dir C: -> Volume in drive C: is system
dir D: -> Volume in drive D: is OS. (Followed by all my personal data and folders)
dir E: -> Volume in drive E: is Recovery. Only Recovery folder (from 2011)
dir F: -> Volume in drive F: is GRMCHPXFREO_EN_DVD. (I assume this is the Recovery CD)
dir X: -> Volume in drive X: is boot. (Followed by many .dll files and .xsl files)
I am a bit confused as some letters are quite different from the ones that were listed when my computer was working (There was only C: drive in My Computer, CD was drive E:, not F: as above...) That's a bit confusing for sure.
I want someone to tell me: Which PARTITION I should make active and where I should configure boot. I gave it up as it's apparently too complicated for me but I need the files stored on the computer as well as the programs. So please, don't tell me to do a repair or custom install.
Also someone should tell me:
On which drive (or volume) I should run this command: net user Administrator /active:yes ?
Which partition to make active?
On which drive (or volume) I need to run: bootrec /fixmbr, bootrec /scanos, bootrec /fixboot, bootsect /nt60 all (is this link any useful: How to Manually Repair Windows 7 Boot Loader Problems ?)
I also tried this: Startup Repair - Run 3 Separate Times
Does this refer to my problem?
That is one useful link: Can' Log Into Windows 7 - Microsoft Community