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Windows spontaneously restarts unexpectedly.You receive out-of-memory error messages even though your computer has much RAM.The computer runs very slowly, and it takes a long time to start.The computer sometimes starts as expected, but at other times it stops responding before the desktop icons and taskbar appear.Windows will not start because certain critical system files are missing, and then you receive an error message that lists the missing files.

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There is much modem activity If you have an external modem, you may notice the lights blinking too much when the modem is not being used You may be unknowingly supplying pirated software.Windows will not start at all, even though you have not made any system changes, and you have not installed or removed any programs.A program disappears from the computer, but you did not intentionally remove itĪ virus infection may also cause the following symptoms, but these symptoms may also be the result of ordinary Windows functions, or problems in Windows that is not caused by a virus.Strange sounds or music plays from the speakers unexpectedly.New icons appear on the desktop that you did not put there, or are not associated with any recently installed programs.Someone tells you that they have recently received e-mail messages from you containing attached files (especially with.Strange dialog boxes or message boxes appear onscreen.

An antivirus program cannot be installed on the computer or it will not run.

An antivirus program is disabled for no reason and it cannot be restarted.

There is a double extension on an attachment that you recently opened, such as.

You received an e-mail message that has a strange attachment When you open the attachment, dialog boxes appear or a sudden degradation in system performance occurs.

The following symptoms are frequently caused by or associated with a virus:

The virus may reduce security This could allow intruders to remotely access your computer or network.

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The virus may install hidden programs, such as pirated software This pirated software may then be distributed and sold from your computer.

The virus may reformat your disk drive and delete your files and programs.

A copy of the infected file may be sent to all the addresses in your e-mail address list.

The infected file may make copies of itself This may use all the free space in your hard disk.

If you suspect or confirm that your computer is infected with a virus, obtain current antivirus software When a virus infects your e-mail or other files, it may have the following effects on your computer: Symptoms of viruses, worms, and trojan horse viruses

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On a Windows XP-based computer, the Protect Your PC Web site can automatically detect and configure Internet Connection Firewall (ICF), configure Automatic Updates settings, and provide information about antivirus software On a Windows XP Service Pack 2 computer, Internet Connection Firewall (ICF) is renamed as "Windows Firewall (WF)."įor additional information about the automated part of the Microsoft Protect Your PC Web site, click the following article number to view the article in the Microsoft Knowledge Base:Ĩ28931 Frequently asked questions about the automated portion of the Microsoft Protect Your PC Web siteįor free virus-related support in the U.S or Canada, call (866) PC-SAFETY (727-2338) If you are outside the U.S or Canada, contact your local Microsoft subsidiary.

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Take steps to prevent viruses even if you do not visit unknown or untrusted Web sites or open e-mail attachments There are three steps that you can take to start to improve the security of your Windows-based computer: use a firewall, receive regular updates, and use antivirus software For step-by-step instructions that explain how to do this for your operating system, visit the following Microsoft Protect Your PC Web site:

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This article discusses how to determine if your computer is infected with a virus, worm, or trojan, how to recover from an infection, and how to prevent future infections from a virus.Ī virus is code written with the express intention that the virus code replicates itself A virus tries to spread itself from computer to computer by attaching itself to a host program It may damage hardware, software, or data A worm is a subclass of virus A worm generally spreads without user action and distributes complete copies (possibly modified) of itself across networks A worm can exhaust memory or network bandwidth, causing a computer to stop responding A virus that appears to be a useful program, but that actually does damage, is a "trojan horse." This article was previously published under Q129972 Much of the information contained herein may have changed since posting.Ĭomputer viruses: description, prevention, and recovery This question was answered on March 4, 2005.