If you have custom panels, extensions and other Fireworks assets you would like to move from one machine to another, just copy the appropriate sub-folders under the location mentioned below into the new machine:
<OS Drive>:\Documents and Settings\<username>\Application Data\Adobe\Fireworks CS5\
<OS Drive>:\Users\yourname\AppData\Roaming\Adobe\Fireworks CS5\
\Users\<username>\Library\Application Support\Adobe\Fireworks CS5\
Once the files from the corresponding sub-folders have been copied, restart Fireworks on the new machine and you will see the same state of fireworks as previous system.