Windows 7 help booting

goodgod

New Member
Hello my little brother was messing around with this New SID number, and before i didnt read the instruction i shut off the computer.now there is something wrong with it, i can log on as guest, my Administrator account is gone. I tried to create a new one but it wont let me. Every time i try to run something is said' please enter password and click yes" but there is no space for me to type in and the only option is to click no.
Now i want to reboot my window 7 with my USB but it keeps asking for Administrator, can anyone help me ?
 
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