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2. Before you install Windows XP Professional in a multiple-boot configuration, scan the other operating systems for viruses. 3. Back up files nightly or as needed so that damage is minimized if a virus attack does occur. 4. Before opening a file from a floppy disk or before starting a computer from a floppy disk, scan the floppy disk for viruses. 5. Do not open e-mail attachments from unknown senders. Delete the e-mail and attachments immediately. 6. When you receive an unexpected e-mail attachment from someone you know, verify that the sender intended to send you the attachment. Simply scanning the attachment for viruses is not sufficient because a new virus can propagate without the sender s knowledge. A virus scanner that does not know about the new virus might not catch the virus. If the sender did not intend to send you the attachment, permanently delete the e-mail without opening it.

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7. Never run a file that has a .vbs or .js file name extension unless you know exactly what it is going to do before you run it. 8. Regularly check the Microsoft Windows Update Web site and the Microsoft Office Update Web site for patches that fix vulnerabilities and provide security enhancements. In addition, independent software vendors (ISVs) might also provide security-related patches for other programs installed on the computer. For more information, see the Windows Update and Microsoft Office Update links on the Web Resources Page at http://www.microsoft.com/windows/reskits/webresources. 9. Configure the security settings in Microsoft Internet Explorer to protect against downloading infected files or malicious scripts. For more information about protecting computers from unsafe software, see Internet Explorer Help. 10. Do not allow users to log on as members of the Administrators group on their own computers because viruses can do more damage if activated from an account with Administrator permissions. Allow users to log on as members of the Users group so that they have only the permissions that are necessary to perform their tasks. 11. Configure Windows Explorer and My Computer to show extensions for known file types, show hidden files and folders, and show protected operating system files. For example, a malicious file with the name Report.doc.vbs appears in Windows Explorer and My Computer as Report.doc unless you deselect the option to hide extensions for known file types. To change these settings, in My Computer, click the Tools menu, click Folder Options, and then click the View tab.

connection. This button is not used to configure LAN access settings, such as in the case of Digital Subscriber Line (DSL) modems, cable connections, or local area connections. See the next section for details.

To remove a virus from your computer, use a current, well-known commercial antivirus program that is compatible with Windows XP Professional. In addition to scanning the hard disks on your computer, be sure to scan all floppy disks that have been used in the infected computer, in any other computers, or with other operating systems in an infected multipleboot configuration. Scan floppy disks even if you believe they are not infected. Many infections recur because one or more copies of the virus were not detected and eliminated. If the computer is already infected with a boot sector virus and you install Windows XP Professional into a multiple-boot configuration, standard antivirus programs might not completely eliminate the infection because Windows XP Professional copies the original MS-DOS boot sector to a file called Bootsect.dos and replaces it with its own boot sector. The Windows XP Professional installation is not initially infected, but if the user chooses to start MS-DOS, Windows 95, Windows 98, or Windows Me, the infected boot sector is reapplied to the system, reinfecting the computer.

Part V:

The connection s settings dialog box, shown in Figure 6-4, gives you three configuration options for connecting to a proxy server.

Do not depend on the MS-DOS command Fdisk /mbr, which rewrites the MBR on the hard disk, to resolve MBR infections. Many newer viruses have the properties of both file infector and MBR viruses, so restoring the MBR does not solve the problem if the virus immediately reinfects the system. In addition, running Fdisk /mbr in MS-DOS on a system infected by an MBR virus that does not preserve or encrypt the original MBR partition table permanently prevents access to the lost partitions. If the disk was configured with a third-party drive overlay program to enable support for large disks, running this command eliminates the drive overlay program and you cannot start up from the disk. Caution