Following are some tips in helping to combat the growing threat of viral infection： 1． Use an automated virus-detection tool； 2． Regularly perform a backup of your data with a backup program； 3． Prevent unauthorized access to your computer by using a security access program； 4． Use writer-protected tabs on all program disks before installing any new software.If the software does not allow this,install it first,then apply the write-protected tabs； 5． Do not install software unless you know it has come from a reliable source.For in.stance,service technicians and sales representatives are cornmon carriers of viruses. Scan all demonstration or repair software before use； 6． Scan every floppy disk before use and check all files downloaded from a bulletin board or acquired from a modem； 7． Educate employees.As the adage goes,"An ounce of prevention is worth a pound of cure."； 8． Do not boot from any floppy disk,other than a clean,DOS-based disk； 9． Avoid sharing software and machines； 10． Store executable and other vital system parameters on a bootable DOS-based disk and regularly compare this information to the current state of your hard drive.