recovery console password

hi,i have a big problem and need your help.when i turn on my pc,the message will appeared:
“WINDOWS COULD NOT START BECAUSE THE FOLLOWING FILE IS MISSING OR CORRUPT = windows\system32\config\system”.i am trying to fix it in recovery console but i can’t access it because it need a administrator password.this is weird because my pc don’t have any password before.how to solve my problem because i need to save my files in my pc and don’t want to format it.help me to solve my problem.need your help,pleaseeee.thnaks.