Sorry for the inconvenience caused , As you say that mcafee fixes the problem when clicked on the fix button , I believe this should be a problem in updates.
Could you please check whether there exists any other antivirus software in control panel or its files and folders C:/program files & common files.
And regarding the issue that your unable to connect with chat / not able to click any option in the website , it should be a issue with your browser as Im able to click on the link you posted and get to the support page.Kindly try to reset your internet explorer (Open IE - click tools - click reset from advanced tab)
Do report back on the status, so that we could try our best to reolve your issue.
Yesterday I had to remove and install McAfee Internet security to get it working again. This time the problem with the update occurred but when I clicked the M-icon, nothing happened.
I am really sick and tired of the whole McAfee stuff and will go and look for something else when my subscription ends.
But when I want to cancel my subscription, the 'old' problem of not being able to click on something at the support pages occurs again!!
I will try to reach clientsupport by (expensive) telephone.