Run below command to uninstall it

%systemroot%\$NtUninstallKB940157$\spuninst\spuninst.exe

If it fails and you get a “The system cannot find the path specified.” error, then download the zipped copy from here. To work out where to extract it to, type:

echo %systemroot%

Open the zip file, and extract the $NtUninstallKB940157$ to this location. Then repeat step 2.