Why is my computer infected with virus? how to remove computer virus? Why is my computer infected with virus and what
should I do to get rid of this problem?
This is the question I occasionally get from customers when their computer has
unusual issues. Hopefully this article will help you find out the answer to
these questions.
There is
a lot of damaging software on your computer such as Trojans, adware, worm, spyware,
bonnet, keylogger...
In this article, this
dangerous software above are called as computer viruses. This will help you not
to be confused by the concept.
To help you
understand clearer, I will summarize this article into these main parts:
1. Signs
which show that your computer is infected with virus
2. Ways
of spreading computer virus and experience for preventing computer viruses
3. Guide
to handle when your computer is infected with virus.
1. The signs
which show that your computer is infected with virus
• It
takes a long time when starting your computer and it runs slower than usual:
Virus is the reason why your computer starts slowly; However, the computer
starts to run slower also because of other reasons.
• There
are autorun.inf files in the drive: The autorun.inf files are usually hidden
files. If you enable the mode for showing hidden files, you will find this
file.
• Unable
to open the Task Manager, Task Manager is blurred: Right-click on the taskbar
(the horizontal bar located at the bottom of the screen). You will see the Task
Manager is blurry which cannot be chosen.
• You
can't access different websites of the security: Some viruses block the
connection from your computer to the website, main server of security
(e.g.: Kido). If you can't access many websites such
as norton.com or Kaspersky.com while you are still able to access other pages,
your computer is infected with viruses.
• There
are strange notifications when starting your computer. Computer viruses usually
cause errors on your operating system, so be careful if there are strange
notifications on your computer.
Tip:
Look for the phrase in the error notifications on
Google, you may find out the cause of this problem.
• You
can't connect to the Internet, or the connection drops or is slow sometimes.
This is also a sign which shows that the computer is infected with a virus.
• After
infecting a computer, viruses often copy all of your data. Then it sends them
to the main server in order to steal your data. This process will make your
network become overloaded.
• Yahoo,
Face book, and your mail
account automatically send messages to friends, acquaintances with strange
links.
Recommendation:
You should change the password if you get into these
problems above. In addition, you should limit the login on different computers;
you will not know what was installed on these computers.
• To
sum up: If your computer has one of these signs above, be careful because your
computer may be infected with viruses. Do not worry, I'll show you how to
remove them in Part 3 of this article.
2. How do viruses spread to your computer? How to avoid getting a computer virus?
"I didn't do anything! Why is my computer
infected with virus? "This is the question which I heard a lot from many
customers. I want to insist that: 'This is you - the user of computer is the
one who brought viruses into the computer." If you do not believe, read
part 2 of this article on "The ways of spreading computer viruses",
and you will know how you brought viruses to your computer.
Currently, the virus can infect your computer by 3
main ways:
1. Internet:
(yahoo, email ...)
2. External
Memory: Memory Card, USB, portable drive...
3. Local
Network (LAN, WLAN )
2a. Internet
People
who create viruses will take advantage of the internet to spread out the
viruses. Specifically, through email account, chat tools (Yahoo, Skype ...),
social networks such as Facebook, Twitter and forums.
forms:
• They
will send mail to you with the attachments of virus file or links that contain
viruses
• Hijacking
chat tools, social network accounts and use it as a tool to spread virus link.
They will create a new status, which contains virus link;
send a message with the virus link.
• Post
link above on forum or post directly file which contains viruses, attach in a
certain software.
• Install
an antivirus software on your computer, even a free antivirus software. It is
necessary to protect your computer.
• A
suspicious email or message from someone you know. Be careful, Facebook, mail,
yahoo account of them may have been stolen.
• When
the email is sent automatically (from the forum, the website you are already
registered, paypal, facebook ...) containing the link. Do not click on the
link, let's see who sent it.
• If
you participate in forums, you are trying to download one software or click on
a link which was sent by forum members. Please find out more information about
this member. Are they worth to trust? And also pay attention to the feedback
from other members.
2b. External memory (Memory
card, USB, portable drive)
You
may plug the USB into a computer which is infected with viruses, then plug into
your computer without using any antivirus program. Congratulations, your
computer has been infected with viruses. Remember that most of the automatic
virus infects your computer when you plug the USB in.
How to avoid virus infection from external memory:
When
you plug in the USB, memory card, portable drive on the computer. You should
use antivirus software to scan it before opening. This is a simple and
effective experience for preventing virus from spreading through external
memory. However, many people do not pay attention to this.
Use one
additional anti-virus software on the USB. We encourage that you should use USB
Disk Security. It is a software that helps you easily remove viruses on USB and
other external memory without slowing down your computer.
2c. Local Area Network (LAN)
The computers in
the local network are more likely to spread out the virus to others. Therefore,
to prevent computer virus you should pay attention to these things:
• Use
an anti-virus software which has firewall function.
• Turn
on your Windows firewall: Click Start button => Control Panel =>
SecurityCenter => Windows Firewall. On the General tab, select
On.
The
ways to spread out computer virus
3. How to remove
viruses away from your computer
In this section,
I won't go too deep into how to remove each type of virus; However, I will show
you some solutions for removing viruses automatically by the antivirus
software.
You should follow 3 steps of this solution:
- Step 1: Remove viruses by a
trustworthy anti-virus software
I encourage you to install and use one of the
following antivirus software below:
•
Kaspersky
Internet Security
•
Norton Internet
Security
•
Bitdefender
•
AVG
After
installation process, you should scan the whole computer (full scan). Follow
the instructions of the software to remove away the virus.
- Step 2: Remove malware, adware
Anti-virus
software is not good for some illegal malware or adware on your computer.
You will need to
install other additional tools in order to remove the ads on your web browser.
There are some reliable software for removing malware include:
• Malwarebyte
• SupperAnti
Malware
Step 3: Fix issues on operating system
Some software
like Kaspersky have additional tools to restore the operating system which is
failed. However, it just can recover some basic errors.
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