Download this linux program from this site http://ophcrack.sourceforge.net/
burn to an iso image,put the new disc in at bootup,make sure your machine boots from the disc--this will put up all of the passwords on the machine.
Click start run type cmd press Enter
black screen should open DOS mode
this will vary depending on your operating system
type in net user username
For eg. If you want to change administrator password , type net user Administrator
it will prompt you to enter the new password
enter the new password and the password is changed
hope this helps
you will need your Acer recovery disk
insert into CDROM tray
Restart the Acer Aspire. When Windows boots up, select the username you want to reset the password for and press "Enter."
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