It sounds like some kind of malware. The warnings he is receiving are probably false warnings that will try to get him to purchase a certain product to remove the alleged virus. Try running an online scan. (links below)
Panda Active Scan
http://www.pandasoftware.com/products/activescan.htm
Kaspersky Online Scan
http://www.kaspersky.com/service?chapter=161739400
Trend Micro Housecall
http://housecall.trendmicro.com/