This update eliminates two security vulnerabilities:

1. The "Spoofed Route Pointer" vulnerability. This vulnerability could allow a malicious user to obtain network or other information by performing source routing via your Windows 98 computer, even if source routing has been disabled. Installing this update will eliminate this vulnerability and provide additional control over source routing.

   For more information, please read Microsoft Security Bulletin MS99-038. (This site is in English.)

2. The "Fragmented IGMP Packet" vulnerability. This vulnerability exists in TCP/IP stack implementations of Microsoft Windows 98. If fragmented or malformed, Internet Group Management Protocol (IGMP) data packets can cause a variety of problems in Windows 98, ranging from slowing system performance to system failure.

   For more information, please read Microsoft Security Bulletin MS99-034. (This site is in English.)

1. Click Start, point to Find, and click Files or Folders.
2. Search for 238453un.inf
3. Once this file is displayed, right-click on the file and choose Install.

1. Click Start, point to Programs, and then click Windows Explorer.
2. Click Tools, and then click Folder Options (in some versions of Windows, Folder Options is located under View).
3. Click the View tab.
4. Under Hidden files, click 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 visible only temporarily. To hide the system files after receiving your search results, follow steps 1 through 3, above. For step 4, click Do not show hidden or system files.