Read Me First

This update eliminates the "Spoofed Route Pointer" and "Fragmented IGMP Packet" vulnerabilities in Microsoft Windows 98 and is discussed in Microsoft Security Bulletins MS99-038 and MS 99-034. Download now to help prevent a malicious user from using source routing to obtain network information through your Windows 98 computer, and to protect your computer's performance when it encounters fragmented data packets.

The "Spoofed Route Pointer" vulnerability could allow a malicious user to obtain network information by performing source routing with an affected Windows 98 computer, even if source routing has been disabled. Installing this update eliminates this vulnerability and provides additional control over source routing. For more information about this vulnerability, read Microsoft Security Bulletin MS99-038.

The "Fragmented IGMP Packet" vulnerability exists in TCP/IP stack implementations of Windows 98. If fragmented or malformed, Internet Group Management Protocol (IGMP) data packets can cause a variety of problems in Windows 98, ranging from poor system performance to system failure. For more information about this vulnerability, read Microsoft Security Bulletin MS99-034.

How to download and install
Save your work and close all open programs before installing.

1. Click Next at the top or bottom of the page.
2. Select your language, review the licensing agreement, and then click Download Now.
3. Do one of the following:
   • To start the installation immediately, click Run this program from its current location.
   • To copy the download to your computer for installation at a later time, click Save this program to disk.

How to use
You don't need to do anything after installing this update.

How to uninstall
Save all your work and close all applications before attempting to uninstall this component. To uninstall this update, you must have your original Windows 98 or Windows 98 Second Edition CD available.

1. Click Start, point to Find, and then click Files or Folders.
2. Search for 238453un.inf.
3. Right-click the file, and then click Install.

Note 238453un.inf is a system file. If your search returns no results, the system files might 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, Folder Options may be 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.