Try to boot from windows vista dvd or if u have oem computer go to repair options !!ok 
Boot to Win 
RE
Click Command Prompt  
option.
Type the following command:
C:
CD Windows\system32
ren cmd.exe cmd.old
ren magnify.exe cmd.exe
ren cmd.old magnify.exe
Restart computer
Click on Easy of Access centre left side bottom � Choose Magnify option � Command prompt 
opens up
Type: net user 
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