Polisei.dll -

: It is frequently part of the Reveton ransomware family, which specializes in social engineering to trick users into paying bogus fines.

: Never follow the instructions or pay any "fines" mentioned in related pop-ups; these are scams.

: Use reputable antivirus software to perform a full system scan.

: You can check the file's hash on sites like VirusTotal to see if other security engines have flagged it.