Diskettes are relatively unreliable and WILL inevitably fail, so make more than one copy of important documents. There are many commercial programs that scan for viruses. It will notify the user of any viruses or irregularities. The program will also notify the user if an attempt is made to use an infected disk. Remember to update the virus program files often because new viruses are being made every day.
Common Sense Do Always use the proper shut down sequence to turn off the computer.
Keep liquids away from all parts of the computer. Use a surge protector. Unplug the computer during electrical storms. Don't Place magnets or magnetized items near a computer. Let the computer get too hot.