Hello gang! Can you guys help refresh my shriveling brain?
When migrating to a new computer, or in my case a new user profile (old one was corrupt), is there a prefs file that I can copy and replace that will be all my PS settings/plugins etc straight over as I had them on the old one? If so....where?
Many thanks in advance!

Let me google that for you:

For preferences:
http://madcatphotography.wordpress.com/2013/07/03/restoring-photoshop-settings/

I haven't done this, but worth a try.

For plugins - you need to copy over the files from Program Files/Adobe/Adobe Photoshop xx.x/Plug-ins folder. Not quite sure how it works for paid plugins with serial #s or activation.