FIOS router detected a virus on a computer attached to the network.

A coworker said that he received an email from FiOS that says a virus was detected on a computer when attached to our router. My computer was the only one connected today. I looked this up online and have not been able to find any reference to a legitimate email from Fios that makes this claim. I also have FIOS at home and have never received an email like this before. After a virus scan with Kaspersky, my compuer comes up clean. Does any one have any idea if this email is legitimate and if so what is the issue causing it to flag my computer here but not at home?

Thanks, 

 GoldenSilver