Windows 10: Passwords not recognised, reset required

Hi,
I need some help. I recently had a Windows update and on restart I was asked for the password. I tried my pin - but it was not accepted. I then used what I thought my password had been before I changed to using a pin but as it is a while ago I may have got it wrong because it was still not accepted. I then tried a few other possible passwords - no luck. I changed to chose to use my Mictrosoft Log-in details (which I never use) and again this was not accepted. After 20-30 attempts on various potential passwords I left the laptop for a few minutes and when I returned it had the 'PIN' screen up - and my pin mumber was accepted. I did a full shut down and when it restarted I had to go through the same sequence again.
Clearly something is not working as it should - and all my passwords seem to be invalid. How can I start again with new login details for both the local log-in and for the Microsoft log-in?
Help would be very much appreciated.
Best wishes

:)

 

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Hi TNK,

Is there any way you can beef up the details of your system specs so we can get a better idea of what we are working with here? I'm mainly interested in your keyboard. I'm thinking that there might be something wrong with your keyboard hardware.

A quick fix might be to try plugging in a different keyboard and try logging in with that.

Snarks *Cool

 

Hi Snarks,
Thank you for taking the time to reply.
I am sorry but I don't have an 'external' keyboard for my laptop. The Laptop is a Dell Inspiration Intel Core i3 400 5u CPU @ 170Ghz 4Gb of RAM. I use the laptop a lot and I have not noticed any issues concerning the keyboard - but then I am just a user. The OS is Windows 10 - Home.
This is probably not very helpful....

*Confused