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Computer infection features

There are several features detecting that your computer is infected. Some “strange” things start happening to your PC, like:

abnormal messages, images are displayed and sound signals are produced;
CD-ROM tray opens and closes unexpectedly;
some programs start running arbitrary on your PC;
a message is displayed informing that one of your programs is trying to connect with the Internet, though you have not initiated any actions.

Then it is likely that your computer is virus-infected.

Besides there are several features of virus infection via e-mail:
Your friends and acquaintances tell you about messages from you that you did not send;
A lot of messages without a sender's address and subject are in your mailbox.

It should be noted these features are not always caused by viruses. Sometimes they are sequent by other reasons. For example, infected messages can be sent with your address as a sender address, but they are sent not from your computer.

Indirect features of your computer infection are the following:
irregular behavior of software and hardware, including failures and/or slowing down of computer systems, hanging of system components, etc.
Slow computer work when starting programs
It is impossible to load the operating memory
Files and folders disappear or their contents are distorted
Hard disc activity (the lamp of the system block often blinks)
Microsoft Internet Explorer freezes or acts unpredictably (e.g. the program window is not responding)

In 90% indirect symptoms are caused by faults in software and hardware. Though these symptoms are a slight possibility that your computer is virus infected.

Source: Kaspersky Lab.

Computer infection features

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