Pc Virus Removal - Viruses - Worms &
Trojan Horses
Pc Virus Removal - Computer
Virus Removal. The first indication most
people will have that their system has been subject to a
virus is when they start to experience strange behaviour on
their computer, or they suddenly realise that files are
missing or a program does not work normally. Another
indicator is the mass sending of e-mails that you have no
knowledge of.
At this point most people who had not invested in Pc
virus removal software will undoubtably wish they had!
If you think
your system has been infected then
update your virus
files straight away and do a virus scan or if your
computer is unprotected download some anti virus
software right now and check your
system before you do anything
else.
What Is A Computer Virus?
Viruses are actually a particular type of computer
'malware' - a general term covering all types of malicious
software. The most common types are Viruses, Worms
and Trojan Horses.
How Computer Viruses Work
A virus is in a majority of cases hidden
inside another program such as an installation program or a
rogue document or image and is generally
delivered via an e-mail attachment or a dodgy piece of
downloaded software (you get what you pay for!).
Another version and probably the most
troublesome is a boot
sector virus.
Biological viruses require a host organism to live and
reproduce and this naming convention has been adopted by
the computer community because of the similarities to a
computer virus, so when the 'host' program is run, the
virus program also runs.
Once it's in
memory the virus is able to do its dirty work,
which usually amongst other things includes infecting other
system programs.
After the infection stage of the virus, there's
follows a destructive stage. The virus waits for a
pre-determined trigger (for example a specific date or a
certain number of times the virus has replicated itself)
and then delivers what is commonly called a payload.
Payloads range from simple messages to file deletion
commands and in extreme cases even
the destruction of the core operating system.
Spam mail is the most common delivery system
for computer viruses as are hyperlinks contained in
the body of the e-mail and we find
increasingly the culprits are getting very sneaky and
may mask a link making it look like a link to
somewhere else for example the link really cheap
holidays actually takes you to the Microsoft
Office site so if your unsure about the source of a mail
or it has a link you have never visited
before delete it.
Worms
Worms are similar to viruses in that they're
self-replicating. They reproduce themselves across networks
without human assistance, such as e-mail sending. A worm,
though, doesn't need another executable program to be
distributed so can be very destructive and invasive.
Worms usually affect entire networks more than
individual computer systems on the network. Their
self-replicating behavior can quite literally overload
network resources, causing slowdowns in data transmission
by consuming massive bandwidth normally used by every day
network traffic.
Worms can also be designed to carry a payload, using a
'backdoor' installation program. A backdoor is a hidden
access point to a computer or program that bypasses
the normal login security protocols.
Worms are commonly used by spammers to distribute
junk e-mail sometimes carrying their own viruses.
Trojan Horses
Trojan horses are the third common type of
malware. A 'trojan' is a program that pretends to do
one thing but actually does something different.
The term comes from the story of the Greeks who built a
large wooden horse in which to hide. The Trojans
mistakenly believed they'd receive a gift from the
Greeks so they took the horse inside their
compound giving their enemies easy access to wreak
havoc.
This is in effect how a Trojan works but unlike viruses
or worms, a Trojan generally doesn't replicate
itself.
Trojans may be hidden in otherwise useful software and
is quite often found in downloaded cracked programs so if
this is something you do think again, you may be getting a
lot more than you realise and once you do the solution will
not be cheap.
Once started they can do almost anything including
erasing data, corrupting files, installing backdoors and
logging keystrokes so that hackers can steal information
such as credit card numbers and passwords which quite often
can lead to identity theft.
Virus Removal
If you think your computer may have been infected by
either a virus, worm or trojan make sure you run your
Pc virus removal software
without delay, virus removal software should be
considered as a must have by all computer users. If
you find the problem is re-occuring and you are unable
to complete a full virus removal then contact your
local Pc repair professional
by choosing your area from the links provided.
Another version and probably the most
troublesome is a 
Trojan horses are the third common type of
malware. A 'trojan' is a program that pretends to do
one thing but actually does something different.
