Files that were downloaded from the Internet should also be checked using a virus scan program. Whenever possible, write-protect diskettes that are being used. You can read from, but not write to, a write-protected diskette. Also, always reformat the diskette when it is being re-used. Virus Detection A virus is usually detected once it has spread and altered your computer.
Viruses are capable of scrambling or deleting files and directories stored on a computer.
If you notice any of these indications, check your computer with a reliable virus scan.