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Remove SYSKEY Password

Find a way to get to a command prompt (Bootable CD, Windows Advanced Repair)

 

1) Type c:\

2) Type cd users

3) If you see a list of users besides Public, then you are on the correct partition.  Go to Step 6

4) If you only see the default users, then type d:\

5) Continue steps 1-4 until you see a list of usernames besides the default Windows users.  Each time, change the drive letter to the next letter.

6) Once you know you are on the correct partition, navigate to

c:\windows\system32\config

assuming your windows drive is c:, or replace with whatever drive letter you figured out in steps 1-4.

 

7) Rename the following files adding a .OLD to the end

ren DEFAULT DEFAULT.OLD

ren SAM SAM.OLD

ren SECURITY SECURITY.OLD

ren SOFTWARE SOFTWARE.OLD

ren SYSTEM SYSTEM.OLD

8) Navigate to a folder called:
        cd C:\Windows\System32\config\RegBack

Be sure to change C:\ to the drive letter you found in steps 1-4

 

9) Copy the same 5 files listed right above back into:

       copy DEFAULT ..\DEFAULT

       copy SAM ..\SAM

       copy SECURITY ..\SECURITY

       copy SOFTWARE ..\SOFTWARE

       copy SYSTEM ..\SYSTEM

 

10) Reboot, then scan with something like Malwarebytes

11) If the computer will not reboot, you may need to let Windows run a Startup Repair