There is no virus by this name. However, we sometimes get queries about "Codehammer virus", when people see strange characters on screen and see texts like "(C) Codehammer" or "Codehammer rocks your system".
Codehammer is a commercial company specializing in screen savers and screen mates. You're most likely not infected by a virus in this case but just seeing an entertaining screen mate at work.
For more info, contact Codehammer at http://www.codehammer.com
Disinfection & Removal
Allow F-Secure Anti-Virus to disinfect the relevant files.
For more general information on disinfection, please see Removal Instructions.