Have you tried Adobe CreatePDF which allows to create PDF files, convert and Combine them. Though Adobe CreatePDF offers free account users to convert to PDFs online only for 5 times and you can also use Adobe CreatePDF Desktop Printer to convert any file to PDF for 5 times from your Computer . If you installed Adobe CreatePDF Desktop Printer in your Computer as a PDF Printer here is how to uninstall it.
You can install Adobe Create PDF Printer from Adobe CreatePDF by signing into your account.Installed Adobe CreatePDF Printer appears in Printers and Faxes in Windows XP and in Devices and Printers in Windows 7.
Uninstalling Adobe CreatePDF Desktop Printer from your Computer
1.Click Start>Control Panel >add or remove programs in Windows XP or Program and Features in Control Panel in Windows 7,
2.Select Adobe CreatePDF Desktop Printer and click “Uninstall” .
If you can’t find this item in Add or remove programs list, delete the CreatePDF Desktop Printer by right clicking on it and click “Remove Device” in Devices and Printers or Printers and Faxes.