Try setting the clock back and then resetting the clock to the correct time/date. Your alarm will set off again. Now make sure you click the lower left soft button (notification).
You probably didn't get to the softbutton in time. If you don't click the "notification" softbutton, the ppc will keep notifiying you until you do. Which of course is a problem since the softbutton is now gone.
If that doesn't solve the problem, you can fix the notification error by using MemMaid or Pocket Mechanic. They're not free programs, but there is a free trial period -- long enough for you to solve your problem hopefully.
MemMaid
http://www.pocketgear.com/software_detail.asp?id=14279
Pocket Mechanic
http://www.pocketgear.com/software_d...d=373&id=12178