Digital signature not work anymore ...

Hi is possible reset or delete my certificate to create new one ?
Because certificate that I already have stopped working correctly.
I attached a screenshots to demostrate my troubles.

This was happen when admin in work swich local user account to domain user account type – after that operation my signature with my installed certificate do not work anymore, I try reinstall but without success.

it is better to revoke it and delete it then download one new (assume it is a free certificate-email) _ i do not understand " bratislava language ", sorry, so i cannot help in a perfect way just suggest a solution.

I understand.
But unfortunately I forgot the revocation password :(.

delete it & download a new : now you must send e-mail to your friend with your new public key