I got this too.
"Launcher Pro has expired ..." and i was not beeing able to access anything but a web browser. WTF!
Luckily enough i found in another forum that you can type in a market link in the browser (market://search?q=pnamerg.adw.launcher)
I was thus able to install ADW launcher and was prompted to use that one instead. Now all my screens are back.
I registered to this forum just to post this and try to help anyone who had the same problem as me, because i think it is absolutley horrible how LP (free) disabled the phone if it was not updated.
How can any of you LP-free users be sure that this will not happen again?
I will never ever use LP again. Ever.