The personal computer is one of the greatest tools ever invented by man and almost everyone in a company these days will need to be able to use one to do their job properly. Because computers are so important and expensive, most companies have policies about their use.
Most companies are very careful about viruses these days. If you use floppy discs from others, you should always use a virus scanner before you put the disc in your computer.
If the company gives you a password for your computer, you should not write it down on a piece of paper. Try to remember it instead.
If you can choose you own password, don't choose something that others could guess easily such as your name or birth date. Try to remember to change your password every month.
Although MP3's and on-line chat are lots of fun, most companies don't like you use them at work during work time. Not only are you not working efficiently if you are chatting on-line but MP3s can make the Internet really slow for everyone else.