This update eliminates a vulnerability in the Telnet client that ships as part of Windows 98, and is discussed in Microsoft Security Bulletin MS00-033. The vulnerability can allow a Web site operator to take malicious action on a visiting user's computer. For example, this Web page could be configured to create, delete or modify files, reformat the hard drive, or send data to or from a Web page.

For more information about this update and the Telnet client vulnerability, please read Microsoft Security Bulletin MS99-033. (This site is in English.)

1. Click Start, point to Find, and click Files or Folders.
2. Search for TELNETUN.inf.
3. Once this file is displayed, right-click on the file and choose Install.

Note TELNETUN.inf is a system file. If your search returns no results, the system files may be hidden. Follow these steps to display system files:

1. Click Start, point to Programs, and then click Windows Explorer.
2. Click Tools, and then click Folder Options (in some versions of Windows, click View and then click Folder Options).
3. Click the View tab.
4. Under Hidden files, select Show all files.
5. Make sure that Hide file extensions for known file types is not selected.
6. Click Apply, and then click OK.
7. Click Search Now to restart your search.

Important System files should be displayed only temporarily. To hide the system files after receiving your search results, follow steps 1 through 3, above. For step 4, select Do not show hidden or system files.