My mac won't recognize my external hardrive!!

I have a Maxtor One Touch II 300GB external hardrive with all of my pics and backups, and ever since I installed Leopard it won't recognize the drive. I've read other forums and know it's because it's password protected and Seagate or Apple has come up with a solution yet. So I did the only other thing I could...re-install Tiger with my backup disc which was 10.4.7 for my Mac mini Intel. Now it still won't recognize the drive! The software doesn't automatically startup and even after starting it manually it doesn't recognize. I'm guessing because when I re-installed Tiger and it asked me to archive the newer version it must have kept the same coding or whatever. I don't know much about coding so I'm lost there. I have my Powerbook G4 with Leopard on it, but of course it won't recognize that drive on there either. Right now I have a few options I could re-install Tiger on my powerbook and erase everything, but I can't find the install disk and I'm not sure the install disk from the Mac-mini will work because it's for the Intel processor hopefully that won't matter. Another option is to try and see if my wife's HP with Vista will recognize it, but the drive is formatted for Mac so I'm not sure if it'll work and ask for a password. I'm stuck at frustrated right now...if I could just get a computer to recognize it, take the password off... I would shell out the money to get a new drive recognizable by Leopard and transfer the data over. I DO NOT WANT TO ERASE THIS DRIVE!! I know it still works, but I can't access it.  Anyone got any ideas?

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