Hi
It might be a total waste of time installing anti-virus if there is no virus.
Otherwise the situation could go in one of two directions.
1. You find and eliminate the virus on your machine, and also on your colleague's machine, and you are a bit of a hero, and perhaps the managing director will reward you with a pay rise because you have provided protection which the I.T. department failed to deliver.
2. The virus has spread to every unprotected computer, and when the managing director cannot visit a website he will severely criticise the I.T. department for giving him a broken computer, and they will then quickly find his virus on his machine. After a severe reprimand for not providing protection they will rapidly go around to every P.C in the company and cleanse and install protection. They may well discover evidence on your machine that Norton has been installed against company policy. NB once Norton is installed it may be almost as difficult to remove as a virus itself - or so I have heard.
If the managing director has been inconvenienced the rewards could include dismissal, and I.T then have the difficult decision of whether to admit it was their fault, or whether to choose as scapegoats any violators of company policy - e.g. anyone found in possession of a USB Flash Drive, or anyone with unauthorised software on their machine.
Best of luck
Alan
