cannot flush dns HP windows 10

[robertstyers]

have tried cmd prompt flushdns but displaydns still show a large filehave tried powershell alsohave stopped reboot/start reboot dnsclient with regedithave gone to each browser and cleared dns.cannot find any large file for dns on hard drivecannot find anything else to try.ALL virus programs I've tried are clean. and the pc is somewhat slow any ideas

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