Once having been identified ,removal may simply consist of deleting the infected program. In most cases the disinfectant program can remove the virus code and restore the program to its original state. This disinfection will only be attempted if the match on the signature is exact,indicating that the virus not a new variation. Protection Regular scanning of a computer with an up todate antivirus scanner give a reasonable degree of protection. Remember that scanning is just pattern matching against known signatures .
All new viruses are unknown to a out of date scanner.
In addition scanning all disks that are brought to your computer is a good idea. The installation of a memory resident 'watchdog' type of program can give a degree of protection. The degree of protection is imperfect because constant full-scale checking can slow the performance of a computer. Checksumming program can be added to programs to be protected. A checksum is calculated for the program to be protected and stored in a secure pace.