Welcome to the CH forums.
I have to advise that the CH forum rules do not allow the discussion of how to find passwords or "get round" other security measures. One reason is that, while not doubting you, we cannot be certain of the ownership of the pc in question. The pc may have come into possession illegally and the new 'owner' then needs to crack passwords to gain access.
Below is the relevant quote from the
rules..
We do not help with cd-keys, cracks, and warez. This is not negotiable.
Good luck.