I had windows xp firewall and Internet security, also Symantec antivirus.
Hi Sam, don't panic. The message itself maybe the work of scamsters, trying to get you to buy their worthless junk.
Do not download anything or click any link on such messages that pop up when you're on the internet.
A lot of the time, the bad guys will dress up the window to make it look like a genuine Windows XP/ Windows 7/ Firefox/ Internet Explorer message, by auto detecting which Browser/Operating System you're using.
Again, Do not click any link on such windows. Even the "Yes Please"/ "No Thanks" buttons. It's the easiest way to infect your system.
Now, what "Internet Security" do you have? Norton?
1. Firstly, Norton's gotta go. Uninstall with immediate effect. If it doesn't uninstall from "Programs and Features"/"Add or Remove", or with 3rd party apps like Revo/CCleaner, download the uninstall tool from the Symantec website.