I am new to mining and get a old windows 7 machine for testing purpose. The funny thing is that I can't remember the login password. Anyone know how to fix this? thanks
If there is sensitive data on it plug in a new hard drive and install a new copy of Windows 10. Then copy files over from Windows 7. This will be much quicker than trying to figure out the password that you lost. I usually create two accounts on my machines so I can get in in case one is locked out. Save your passwords in something like ewallet.
If no one is around your machines and they are just for mining, don't put a password.
Learn my lesson. This would happen a lot for mining machines. Still look for a way to reset or recover the password as they are a few important data on the desktop.
In this case, i would be using chntpw. The simplest scenario is making a Kali linux usb boot drive, boot with it, then mount your windows partition, go to /%mountpoint%/Windows/System32/config, and use chntpw on the SAM file.
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Make a bootable disc or USB and boot from it to run the programs. It will successfully remove any Windows logon passwords.