The following was found on Geekstogo.com
Click Start > Run > type in the Run dialogue box type C:WINDOWS$NtUninstallKB940157$spuninstspunist.exe This should uninstall that partitcular update. Also I think it is listed in Add/Remove programs. You may have to select "show updates". The above process should remove Windows Search 4
NOTE: I tried uninstalling from Add/Remove Programs; it was listed there as “Windows Search 4” and seems to have been sucessfully uninstalled! 🙂