Hi Phil, I do this all the time. The easiest way is to just zip up the entire Guide folder, copy the zip file to a (large) USB stick, transfer it to the new computer, and unzip it into a new folder of your choice. This will include everything in the Guilde folder.
I have all of my catalogs (UCAC4 etc) in the Guide folder, but others keep them in a separate folder called "Catalogs" or similar. If this is the case for you, just zip and copy both folders (Guide 9 and Catalogs).