Something error with your pin. Pin is not available.

I always use pin to open my pc but oneday ,I open pc and open pin section and click there suddenly open popup and showing that something happen with your pin something error and when I forgot it they will show search in app story but when I click yes nothing will happen and I also forgot my Microsoft password and I'm not able to open pc again, if I can't reset my pc becoz of data loss. Pls provide me some solutions to fix it as soon as possible.