Uninstall is not sent it to the recycling bin and restored it, go to
Start > All Programs > particleIllusion SE > Uninstall particleIllusion SE.
This should remove the PI from you computer now download the software again and unlock it,
just like you did when you bought it in the first time.
P.S
Im sorry but I will not be here in the next 2 weeks so I can’t
send any more replies anytime soon.