I had to reinstall Leopard today. I use Time Machine and the restore was effortless, great. Only problem now is I tried to launch Final Cut Express HD and it asked for a serial number. I pulled out the card with the sticker on it, entered the number, and it said it was not correct. I did it so carefully, after that, and same thing. I have done it four or five times with the same result. The serial has on O in it, and I tried it as a O and an 0, still no luck.