I loaded mac pro by mistake some months ago and had my computer cleaned by PC world it has never been right since.
It won't now let me load chrome and keeps saying the certificate is not trusted but does not allow to bypass this any ideas?

Ash

Please clarify your question as it makes little sense.

Make sure your date an time are set correctly then run updates. You may have to run updates more than once run them until they no longer install anything. Then download the newest chrome