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Sometimes removing CMOS battery of laptop overnight will reset bios parameters.if this does not work you have two other options.Google hirens boot disc 15.1 on another computer and either make a bootable USB. Stick or burn to cd.start laptop in get into bios to change the boot sequence to either cd or USB.let the hirens boot cd run.it installs a small version on windows Xp on the ram and let's you then access the hdd to save all the files and pictures on to other media.it also has many tools including software to read all stored passwords on hdd and bios but I don't recommend this until you have retrieved all you want to save.hope this helps please vote?thankyou.
Google search for "Hirens.BootCD.15.2"
Its free and with it you can boot your computer and view, delete, or change any password on your computer without turning a single screw on your machine, even repair windows problems that are normally a dead issue.
Your bios administrator password, boot password or even HDD password,
Also all your windows or Linux log on or boot passwords
I am currently uploading the cd to my filesanywhere account and will make it downloadable for you if needed, just ask
Just reinstall the OS again. When you don't need to save any data, just turn on your laptop and boot into the bios.
When you don't know how to get there look at the scrren during boot up and it will tell you which button you have to press. Can be F2, DEL or even another button. When you are in the Bios, just look around until you find boot priorities and change your boot priority to CD/DVD first followed by the HDD, save and exit. Insert your OS and when it ask you to boot from CCD/DVD hit any key on your keyboard and follow the installation instructions
if locked while booting up, before even windows is loading: you've got a master password in BIOS to worry about.No way but to ask the manufacturer to remove it. if you cannot access windows anymore after booting up: boot up from a win cd, go through setup, install a new copy of windows and try to find your personal files on the disk, back them up and reboot from a win cd again, this time format the whole harddisk and set up a clean, new installlation of windows.(warning: all beforehand data will permanently lost then)