In order to facilitate the resolution of such problems in the Windows operating system boot in safe mode — a special mode of functioning of the system, which loads the minimum number of the most necessary drivers. This allows you to boot even after booting in normal mode was impossible, and to implement a rollback or other actions aimed at restoring the health of Windows.

However, if you want to protect the system from unauthorized modification by user, you may need to disable safe mode, because it allows you to sidestep the various systems of differentiation of access, starting at start in normal mode. It's not easy, but possible if you have the proper qualifications.

  1. Open registry editor (regedit in command prompt or Run window), find the section HKEY_LOCAL_MACHINESystemCurrentControlsetcontrolsafeboot and remove branches and Minimal Network. Of course, you first need to make a backup of this partition, which will allow, if necessary, to restore the original state of the system.

  2. You can turn off safe mode by modifying the system file ntldr. Use any HEX editor to open the ntldr file, and at line 760 replace the sequence "7f 66 1f 53 e8 b8 1c 00 01 cd 16 0f 85 09 66 00" to "7f 66 1f 53 e8 b8 1c 00 01 cd 16 90 90 90 00 66". Previously, you may need to change the file attributes command attrib-r -a-s-h c:ntldr and after the operation to return the original command attrib +r +a +s +h c:ntldr. Of course, make a backup copy of this file also does not hurt, because the damage will lead to the inability to boot in any mode.