Hello, and welcome to Geeks To Go.
A security certificate revoked messege indicates that the website may not be trustworthy.
If the website is not as it presents itself to be the certificate can be revoked.
This is not conclusive, many trustworthy web sites do not even have security certificates.
If you have used the web site regularly with no problems it may be ok.Here
is a link to an article by Microsoft with FAQ about security certificates.
Does this happen with all web sites, or just one?
If it is happening with just one you may want to decide how trustworthy this one site is.
If it is happening with all web sites you may have an infection.
You can turn off certificate checking, the Microsoft article will tell you how.