Sally, what McAfee product are you using?
McAfee Security Center
on Windows 7 Home Premium, 64 bit
First pf all, never click on something you aren't sure about.
In this case however, it looks more like a problem with their servers or their ISP have you checked with them?
By the way, McAfee SecurityCenter could be just about anything. What's the name of the McAfee product?
Doing a little more digging into Barracuda using Google I see that there was a fake anti-malware scam called Barracuda Antivirus, so just in case this is it, please follow the instructions in this guide: http://www.bleepingcomputer.com/virus-removal/uninstall-barracuda-antivirus
Scroll down that page as the first links you see are all advertising, so don't click those please.
Any queries regarding the procedures there you should ask them, guidelines are at the bottom of that page.