Virus or not?
Everybody is talking about computer viruses, but a virus is just one of
many threats for today's computer user. Besides viruses we are also
threatened by worms, trojans, spyware, adware and keyloggers. It is clear that
we can do without them, but click
here for more information on the
differences between the various species.
Despite Antivirus program my PC is infected
all the same! How is this possible?
various reasons your PC can become infected, although you installed an Antivirus
program. To understand this it's helpful to know how your Antivirus program
works. Every Antivirus program consists of a program part and a database with virus definitions.
The latter is a collection of characteristics for all known viruses, so they can be
recognised. Via the internet virus definitions can be actualised automatically.
For commercial Antivirus programs you need a subscription to do so. Usually the
subscription has to be renewed after one year, like with Norton or McAfee. Free Antivirus programs -
like AVG and Avast - do not require a paid subscription.
Infection can occur when the virus definitions are not up-to-date, either because
the automatic update function has been disabled or because the subscription has
expired. Furthermore, there are always a few hours (or sometimes even a few days)
between the virus outbreak and the corresponding update of the
virus definitions for your Antivirus program. So, with a little bad luck, you
can get infected in period in between. Finally, comparative tests show that most
Antivirus programs only protect you against 92% to 99%
of all viruses. Even renowned names like Norton and McAfee can't offer 100%