Microsoft Chinese Knowledge Base: Description, Prevention and Recovery of Computer Virus
2004-01-08 Read: 1482
How to determine if your computer is infected with viruses, worms or Troy, how to recover from infection, and how to prevent infection of viruses in the future.
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Computer viruses are executable files that can be replicated with themselves and evade detection. The virus may escape the detection by disguising it into a legitimate procedure. The virus is frequently rewritten and adjusted so that it will not be detected. The anti-virus program must be continuously updated to find new and modified viruses.
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At least 60,000 kinds of known viruses have been written every day. Currently, most viruses are propagated by email and instant messaging. Virus often reaches emails and disguised into some entertainment information such as pictures, music or greeting cards. Virus may carry a destructive payload such as a worm or Trojm Horse. MORE INFORMATION Microsoft does not provide software that can discover or kill computer viruses. If you doubt or confirm that your computer is infected with viruses, please get the latest anti-virus software. For additional information about anti-virus software vendors, click the article number below to see the article in the Microsoft Knowledge Base: 49500 List of Antivirus Software Vendors
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If the symptoms of viruses, worms and Trojan horse viruses are suspected or confirmed that the computer is infected with viruses, please get the latest anti-virus software. When the virus is infected with your email or other files, you may have the following impact on your computer: infected files may copy itself, so that all available spaces for the optical drive. A copy of the infected file may be sent to all addresses in your email address list. The virus may reformat your disk drive and delete your files and programs. Viruses may install hidden programs, such as pirated software sold and sold from your computer. Virus may reduce security, allowing invaders to remotely access your computer or network.
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The following symptoms are usually caused by viruses or associated with viruses: You receive emails that contain strange accessories. After opening the attachment, the dialog box will appear, or the system performance is suddenly lowered. You have a dual extension on the attachment you have opened, for example, .jpg.vbs or .gif.exe. The antivirus program is disabled and cannot be restarted. Unable to install anti-virus programs on your computer, or the installed anti-virus program cannot run. A strange dialog or message box appears on the screen. Some people tell you that they recently received an email that contains additional files (especially extension-called .exe, .bat, .scr, .vbs), you are actually not sent. The new icon appearing on the desktop is not placed by you, or does not associate with any recently installed programs. The surprises are unexpected in the speaker. The program disappears from the computer but is not intentionally uninstalled. Virus infections may also result in the following symptoms, but these symptoms may be caused by ordinary Windows, or the problem inside Windows is not caused by viruses. Windows can't start at all, even if you have not made any system changes, or have not been installed or deleted any programs. Many modem activities appear. If an external modem is installed, you may notice that the indicator flashes when the modem is not in use. You may not provide pirated software unconsciously. Due to the lack of certain key system files, Windows cannot start, and then you will receive an error message listing these files. The computer sometimes starts as scheduled, but the desktop icon and taskbar have not occurred. The computer runs very slow and the startup time is very long. Even if your computer has sufficient RAM, there will be insufficient error messages. No new programs are installed normally. Windows accidentally restarted. Over the past, the normal procedure has now stopped responding frequently. If you try to delete and reinstall the software, the problem continues to exist. Disk utilities such as Scandisk reports multiple severe disk errors. The partition completely disappears. When you try to use Microsoft Office products, your computer always stops responding. Unable to start the Windows Task Manager. Anti-virus software indicates that there is a virus. Recovering and preventing viral infections from viral infections To prevent viral infections or recover from viral infections, follow these steps: Scan your computer with an updated anti-virus program. Install the latest security patches from the following Microsoft Web site: http://windowsupdate.microsoft.com.Cn/news/23/335.html
Reinstall the anti-virus program (if it has stopped working). Get the latest "virus signature file" from the Web site of anti-virus vendors. For each new virus, anti-virus vendors will release new viruses. After killing the virus, scan your computer again to ensure completely kill the virus. Arrange anti-virus programs inspect the system during your sleep. If one or more of the following conditions are true, you may have to format your computer hard drive and reinstall Windows and all your computer programs: Anti-virus software displays a message that cannot be repaired or killed. Virus is damaged or deleted some important files on your computer. If Windows or some programs cannot start, or when it is started, it indicates that file corruption or loss of error messages, it may belong to this situation. Even after you clean up the workstation, the symptoms described herein still exist, and you can affirm the problem is The virus is caused. Make sure the firewall is installed on your computer. For more information on security and firewall, visit the following Microsoft Web site: http://www.microsoft.com/security/articles/firewall.asp
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For Windows XP-based computers, open the Internet Connection Firewall (ICF). For more information about ICF, please visit the Microsoft Web site below: http://www.microsoft.com/technet/prodtechnol/winXppro/proddocs/hnw_enable_firewall.asphttp: //anheng.com.cn/news/23/335. HTML
For all other versions of Windows, install a third-party firewall. For more information, please visit the Microsoft Web site below: http://www.microsoft.com/security/articles/firewall.asp
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Make sure Microsoft Outlook email security updates are installed: By default, Outlook 2000 SP2 POST-SP2 and Outlook XP SP1 include this security update. Outlook 2000 PRE-SR1 and OUTLOOK 98 do not include this feature, but can be obtained by installing Outlook email security updates. For more information about Outlook Email Security Update, visit the following Microsoft Web site: http://office.microsoft.com/downloa...0/out2ksec.aspx
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Configure Outlook Express 6 to disable access to virus attachments. The earliest version of Outlook Express (Pre-Outlook Express 6) does not include attachment blocking functions. Be careful when opening an accessory with an attachment with your request. Active script is banned in Outlook and Outlook Express.
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Note: By default, an active script is banned in Outlook Express 6 and Outlook 2002. For additional information about how to ban active scripts in Outlook Express, click the article number below to see the article in the Microsoft Knowledge Base: 192846 OLEXP: How To Disable Active Scripting in Outlook Express
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For additional information about how to ban active scripts in Outlook 2000, click the article number below to see the article in Microsoft Knowledge Base: 215774 OL2000: Scripts Embedded in Html Messages Run without Warning
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For additional information about preventing viruses in Outlook Express, click the article number below to see the article in the Microsoft Knowledge Base: 291387 Using Virus Protection Features in Outlook Express 6
