Useful software is available from this page
This program allows the user to join a number of separate PDF files into a single concatenated PDF file it requires Ghostscript to be installed on the same PC. Ghostscript can be downloaded via it's homepage www.cs.wisc.edu/~ghost
Download the program using the link below and extract the files using the paths in the zip file (the default is c:\Program Files\JoinPDF). Drag the shortcut to your Desktop. On first use the program will ask you set the path to the ghostscript gswin32.exe file. This can be changed using \View\options.