How can I transfer my old settings to my new PC?

First, install MWPro 7 to your new PC from here:

http://www.firetrust.com/en/products/mailwasher-pro/download

Then, to transfer your old data, (OPTIONAL) click File>>Export, and save the exported file somewhere you can locate it to move it to your new PC.

Then, within MWPro on the new PC click File>>Import and import this file.