I uninstalled the program and rebooted, as you suggested. However, as I had feared, I cannot re-install it because neither the Premium version or Platimum version exist on my machine anymore.
I tried copying the Premium version from a backup but that doesn't work, it has to be installed and I don't have the old Premium version anymore because the new version deleted it.
I bought the back-up disk when I purchesed PD8 but thats no good because its an upgrade from the premium version which I don't have anymore.
BTW, its the Suite package, contains PD8, as well as Power2Go and PhotoNow and LabelPrint. Of course none of them work now.
That sucks