Cannot remove MS Update 918118 "This update cannot be removed" in Add/Remove Programs

I have to remove Microsoft Update 918118 from a Windows XP SP2 computer.  I'll then have to manually do the workaround listed here to negate the vulnerability:

http://www.microsoft.com/technet/security/bulletin/ms07-013.mspx

The reason for removing the update is that it confilcts with the version of Inventor we use and does not allow editing of text in drawings when installed.  There is a patch for Inventor, but not our version.

When I go to Add/Remove Programs to uninstall update 918118, it shows up, but says "This update cannot be removed" and there is no button to remove it.

I found this article on Experts-Exchange about a similar issue:

http://www.experts-exchange.com/OS/Miscellaneous/Q_21766610.html

I tried those steps and manually installed the update, but the $NtUninstallKB918118$ folder still does not show up in C:\Windows.  When I search for 918118, I find files and folders in a $hf_mig$ directory.  I tried running the uninstall from a KB918118 folder there, but get an error that spuninst.exe cannot run.  See attached for error.

The problem may be because the system came with XP SP2 installed from Dell.  I'm considering manually installing SP2 and all subsequent updates hoping I'll be able to uninstall 918118 after that.  If anyone's encountered a situation like this or has any suggestions, please post.

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