Boot the usb.
Go to Troubleshoot, then Command Prompt.
In the cmd window type:
cd c:\windows\system32\
copy sethc.exe sethc.bak
copy cmd.exe sethc.exe
Now restart the computer without the usb stick.
At the login screen, hit the Shift key 5 times. You will get an elevated cmd prompt now.
If you want to change a user's password, type:
net user username(the user) password(the password you want)
To add a new user account to windows type:
net user username(you choose) password(you choose) /add
net localgroup administrators username(the one you chose) /add
There, now you are admin on windows.
Go to Troubleshoot, then Command Prompt.
In the cmd window type:
cd c:\windows\system32\
copy sethc.exe sethc.bak
copy cmd.exe sethc.exe
Now restart the computer without the usb stick.
At the login screen, hit the Shift key 5 times. You will get an elevated cmd prompt now.
If you want to change a user's password, type:
net user username(the user) password(the password you want)
To add a new user account to windows type:
net user username(you choose) password(you choose) /add
net localgroup administrators username(the one you chose) /add
There, now you are admin on windows.