Use the below link which shows how to reinstall the Operating System to factory defaults. Once you perform system recovery all the data stored in the unit will be deleted and the unit will be set to day one.
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I've see lots of posts in this forum where folks said that they tried to do a reset but the PC prompted for their password to start running it. If that proves to be the case with yours, you need to consider an alternative approach ...
Sorry, we're not allowed to tell you how to bypass the password ... but ... if you Google for Trinity Rescue Kit, you will be lead to a site where you can download an image file from which you can burn a CD. They might also have USB images -- don't know for sure.
If you get a lot of results, then go to the MajorGeeks site -- that is trustworthy.
Once you have this, you have a choice of media to create: 1) If you can boot from CD, download and install ImgBurn and use the Write Image to Disk option to create a bootable CD. 2) If you can boot from USB, download and install RUFUS and use the option to create a bootable USB stick from the ISO file.
Once you have made the boot media, boot your PC and use the option to BLANK the password.
After that, you should be able to login to the PC -- and then, set a new password.
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