windows 7 32 bit ultimate
i have a huge problem my friend was new to the cmd so he was playing with the new commands then he used this commands "net user youssuf (his user name) %random%"
then he restarted his computer and he obviously didn't know his password.
i tried to reset his password using offline nt password and registry editor I used it to let his password be blank but it didn't work.

then i tried ophcrack that i was sure it was going to work but it said in the black window "no tables found".
i tried to restart the computer but it said the same
then i tried the same cd on another computer it worked perfectly, please help :(

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