Error "PDE.Plugin will damage your computer"

Suddenly when I try to print any document I get the following error messages - "PDE.Plugin will damage your computer" then "HPDM.framework will damage your computer" and finally "Pdftopdf.filter will damage your computer". It then pauses the printer and will not allow it to print. I have tried with different documents and had the same response. My husband used the printer with his laptop and had no problem.

Any suggestions?

[Re-Titled by Moderator]