Failing wix global level isapi install for IIS 7.5

gistfile1.xml

<?xml version="1.0" encoding="UTF-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"
     xmlns:iis="http://schemas.microsoft.com/wix/IIsExtension">
  <Product Id="*" Name="MyIsapi" Language="1033" Version="1.0.0.0" Manufacturer="Me" UpgradeCode="ADD-GUID-HERE">
  	<Package InstallerVersion="405" Compressed="yes" InstallScope="perMachine" />

		<MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." />
		<MediaTemplate />

		<Feature Id="ProductFeature" Title="MyIsapi" Level="1">
			<ComponentGroupRef Id="ProductComponents" />
		</Feature>
    <Property Id="MYINSTALLDIR" Value="C:\MyIsapi" />
	</Product>

  <Fragment>
    <Directory Id="TARGETDIR" Name="SourceDir">
      <Directory Id="MYINSTALLDIR" Name="MYINSTALLDIR">
        <Directory Id="INSTALLFOLDER" Name="Dlls" />
      </Directory>
    </Directory>
  </Fragment>

  <Fragment>
    <ComponentGroup Id="ProductComponents" Directory="INSTALLFOLDER">
      <Component Id="IsapiDll" Guid="ADD-GUID-HERE">
        <File Id="isapidll" Name="isapi.dll" Source="isapi.dll" />
      </Component>
      <Component Id="IisFilter" Guid="ADD-GUID-HERE">
        <CreateFolder />
        <iis:WebFilter Id="IisFilter" Name="MyIsapi" Path="[INSTALLFOLDER]isapi.dll" LoadOrder="last" Description="MyIsapi" />
      </Component>
    </ComponentGroup>
  </Fragment>
</Wix>