Chapter 10. Frequently Asked Questions - KAPERSKY ANTI-VIRUS 5.0 - FOR WINDOWS WORKSTATIONS Administrator's Manual

CHAPTER 10. FREQUENTLY
ASKED QUESTIONS
This chapter is devoted to the most frequently asked questions from users
pertaining to installation, setup and operation of the Kaspersky Anti-Virus; here
we shall try to answer them here in detail.
Question: Is it possible to use Kaspersky Anti-Virus with anti-virus
products of other vendors?
We recommend uninstalling anti-virus products of other vendors prior to
installation of Kaspersky Anti-Virus to avoid software conflicts.
Question: Kaspersky Anti-Virus does not rescan files that have been
scanned earlier. Why?
This is true. Kaspersky Anti-Virus does not rescan files that have not
changed since the last scan.
That has become possible due to new iChecker and iStreams
technologies. The technology is implemented in the program using a
database of file checksums and file checksum storage in alternate
NTFS streams.
Question: Why does Kaspersky Anti-Virus cause a certain decrease in
server performance, noticeably loading the CPU?
Virus detection is a computationally intensive mathematical problem
requiring structural analysis, checksum calculation and mathematical data
conversions. Processor time is therefore the main resource consumed by
Kaspersky Anti-Virus, and each new virus added to the anti-virus
database increases the overall scanning time. This is a necessary
sacrifice for the security and safety of your data.
Other anti-virus products speed up scanning by excluding both viruses
which are less easily detectable or less frequent in the geographic
location of the anti-virus vendor, and file formats that require complicated
analysis (e.g. PDF) from their databases.
In contrast, Kaspersky Lab believes that the purpose of Kaspersky Anti-
Virus is to establish real and complete anti-virus security for its users. We