How can I login to my Win 10 user account?

Whenever I boot my PC, I'm logged into a Temp user account and get a message displayed saying "We can't sign in to your account". I have tried going into registry and deleting this profile (and renaming the main one by taking away the .bak extension) but the temp profile is just recreated the next time I boot my PC.

Any suggestions? Many thanks in advance.
 
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