Recently, there is a new type of virus called W32.Esbot.A Worm widely spreading.
W32.Esbot.A is a worm that spreads by exploiting the Microsoft Windows Plug and Play Buffer Overflow Vulnerability (described in Microsoft Security Bulletin MS05-039).

Sony recommends all VAIO users having the virus definitions of the Anti-Virus program installed on the VAIO computer to be updated to the latest virus definitions.

How To Check For Infection/Remove The Virus/Protect Against The Virus

Please refer to the following websites.
Symantec (Norton Antivirus)