Windows 10: Windows recovery and password issue

Hi, I,ve deleted the catroot file from system32 and on restarting, my pc won't boot. I tried troubleshoot but asking account password when entered after reset, shows wrong.please help

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hdd password recovery

howdy. if this isnt the right forum please move it.
a friend has a 3 year old hp or compaq tower. they called me to help. they are not able to get into the admin accound, because the password was changed. it was changed by them when a popup told them for security they should change thier password.
after it was changed they could no longer get into the admin account with the password they changed it to, and the computer started sending out emails to everyone on her address list with porn and viagara type adds.
i ran anti virus and we found 20 trogans, virus, ect. everything comes back clean now, but we still cant get into asdmin account to format drive.she doesnt have a vista system disc, just the recovery partition.
1.. is there a way to get the password?

2... if not can i install a new hdd and install from her recovery partition?

3...will i be able to install new hdd and install vist from my disc or is the mb set up to not alow that?

thanks for any help, they are on a limited budget and are true friends to me and i would like to help them. thanks! sam

 

Password issue

After going through the steps to make a new password, after a week or two, my login credentials are no longer valid. I'm forced to make a new password all over again. It seems to happen if I don't login in a certain period of time. Does our passwords expire???

 

admin password?

You can reset the Admin Password using Windows XP repair; See Here for step by step.

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