I've never experienced this message before. I have not had a virus or malware be detected in a year. This came up when I tried to close KVIRC, an IRC client program and turn off my laptop via the power button.
Was this a glitch or something? I'm really hoping it isn't a virus. I haven't experienced any performance issues so..
I should add the laptop appeared to freeze. I powered down, rebooted, and everything seemed to run normally.
UPDATE: Microsoft security essentials picked something up with a full system scan. Not sure if the 3 viruses were related.
This happened a little after 2:00 am, if that helps in sifting through the data.