MMPC Model 10/20  (250-1640/41)    Computer Viruses    Faxback Doc. # 2535

A computer virus is a program intended to destroy systems by corrupting
data.  Diskettes, networks, and modem transfers can carry viruses.  When
files from an infected computer are used on another system,  the virus
spreads.

Problems might occur as soon as the virus invades the system, or the
virus might wait for a preset time before becoming active.

Prevention

Viruses spread through contact with other systems via diskette, modems,
and networks.  To protect your system:

°  Use virus-checking software to scan new diskettes and
   new files before coping or using them.

°  Before making backup copies, insert a write-protected,
   bootable system diskette into the diskette drive.  Reset
   the system by turning off the computer, waiting at least
   30 seconds, and then turning on the computer.  Do not
   press CTRL+ALT+DEL to reset.

°  Use only write-protected master diskettes to make backup
   copies.

°  Always keep a write-protected copy of a startup diskette.
   If a virus infects your hard drive, you can still start
   up with this diskette.

°  Keep copies of files on write-protected diskettes.

°  Be wary of copied or pirated software.

°  Do not assume that legitimate, packaged software is free
   of viruses.

°  Contact your computer dealer or your public library for 
   more information concerning protection against viruses.

Diagnosis

Virus symptoms can mimic symptoms of simpler hardware problems, such as
those caused by bad cable connections or poor memory chip contacts.
Follow earlier troubleshooting suggestions before seeking repairs.  If
you think your computer has a virus , use current virus-scanning programs
that can recognize recent viruses.



(smc-02/02/94)