Web-to-Host supports these client operating systems:
Microsoft Windows Installer (MSI), an installation and configuration service, must also be installed on the client PC before installing Web-to-Host Pro and advanced features of Java, such as native access.
If no MSI is on the client workstation, an error message is displayed. Web-to-Host does not pre-install MSI. You can download the latest version from:
http://www.microsoft.com/msdownload/platformsdk/sdkupdate/psdkredist.htm