How to protect your computer against viruses

How to protect your computer against viruses
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To protect your computer against viruses, follow these steps:
On the computer, turn on the firewall.
Keep the computer operating system up-to-date.
Use updated antivirus software on the computer.
Use updated antispyware software on the computer.For more information about how to protect a computer against viruses, visit the following Microsoft Web site:
(http://www.microsoft.com/protect/computer/default.mspx





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How to remove a computer virus

How to remove a computer virus
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Even for an expert, removing a computer virus can be a difficult task without the help of computer virus removal tools. Some computer viruses and other unwanted software, such as spyware, even reinstall themselves after the viruses have been detected and removed. Fortunately, by updating the computer and by using antivirus tools, you can help permanently remove unwanted software. To remove a computer virus, follow these steps:
Install the latest updates from Microsoft Update on the computer.
Update the antivirus software on the computer. Then, perform a thorough scan of the computer by using the antivirus software.
Download, install, and then run the Microsoft Malicious Software Removal Tool to remove existing viruses on the computer. To download the Malicious Software Removal Tool, visit the following Microsoft Web site: (http://www.microsoft.com/security/malwareremove/default.mspx)

Symptoms that may be the result of ordinary Windows functions

Symptoms that may be the result of ordinary Windows functions
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A computer virus infection may cause the following problems:
Windows does not start even though you have not made any system changes or even though you have not installed or removed any programs.
There is frequent modem activity. If you have an external modem, you may notice the lights blinking frequently when the modem is not being used. You may be unknowingly supplying pirated software.
Windows does not start because certain important system files are missing. Additionally, you receive an error message that lists the missing files.
The computer sometimes starts as expected. However, at other times, the computer stops responding before the desktop icons and the taskbar appear.
The computer runs very slowly. Additionally, the computer takes longer than expected to start.
You receive out-of-memory error messages even though the computer has sufficient RAM.
New programs are installed incorrectly.
Windows spontaneously restarts unexpectedly.
Programs that used to run stop responding frequently. Even if you remove and reinstall the programs, the issue continues to occur.
A disk utility such as Scandisk reports multiple serious disk errors.
A partition disappears.
The computer always stops responding when you try to use Microsoft Office products.
You cannot start Windows Task Manager.
Antivirus software indicates that a computer virus is present.Note These problems may also occur because of ordinary Windows functions or problems in Windows that are not caused by a computer virus.