SOURCE: Administrator Password Problems
when your in the screen where you select a user press ctrl+alt+del then type administrator with no password if she didnt set a pasword for that user then itll go in.. just a matter of removing/changing your other user accounts passwords then.. -this may not always work so tell me if it diddnt :D
SOURCE: FORGOTTEN PASSWORD
Or try IN SAFE MODE with ADMINISTRATOR accaunt i think it should work if ur sister didnt put SUPER ADMINISTRATOR ACCAUNT!!! If this solved your problem please rate this solution as "Solved" or ask here again in order to find another possible cause
SOURCE: reset bios password or remove
The laptop password cannot be reset by removing the battery and there is no jumper for the CMOS or bios reset. You must go to Acer to obtain the master password as laptop computers have NVRAM (non-volatile RAM) that retains the password forever as an anti-theft protection. Steve Medley
SOURCE: need to bypass primary master HDD user password
send me ur email and I'll give you link for software to remove all passwords in bios or windows
SOURCE: how to remove acer aspire 5610z laptop bios
For that you need to reset factory defaults settings for bios.
For reset bios u have to open back side of your laptop then u find motherbord circuit there.
pull cmos cell on motherbord for 15 minute then it reset to defaults.
Also u can reset with jumper settigns read carefully on mother bord there is 1 jumper near cmos cell u read there " bios reset or clear"
It is on 1-2 position right now set it in 2-3 position then power up then all bios settings are reset.
then again set it in 1-2 its original position.
Then it not want password.
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