Can you help me with my External Hard Drive?

Hey everyone,
I'm having a big problem with my external hard drives. Firstly, I'll give you all the information I think you might need-
* I'm running on Mac OSX 10.4.11.
* I have the most recent release 13" Macbook and it has plenty of memory left.
* Both my EHD's are made by LACIE. One is 250GB (18 months old) and the other 500GB (2 weeks old).
* Both work perfectly on every other computer I've tried - (2 Macs and 2 Windows).
* Both are formatted as FAT32 because I need to use them on Mac at home and Windows at work.
Now, the problem is every time I mount one of the EHDs on my laptop, they show up on the desktop but when double clicked (or Apple + O 'ed) they cause Finder to have a spaz, with the top white bar disappearing along with everything on my desktop (for about 2s).
What I have *tried so far*-
* Mounting and unmounting the EHDs.
* Turning on and off both EHDs.
* Plugging them in one at a time.
* Restarting the Macbook and plugging them in after it has fully loaded.
* Restarting the Macbook and plugging them in as it loads.
* Creating a new user account to open them in.
* Verifying both EHDs using Disk Utility - both claim to be working properly.
* That trick where you take out the battery and power source, hold down the On button for 5s, then hold Apple + P + R + Option while the Macbook turns back on.
None of these have worked so far. Please help!
Thank you so much in advance,
Joe

Have you tried opening them in a Finder window? Also, you might boot to your Install DVD and launch Disc Utility to verify and repair both permissions and your drive.
Sounds strange. I also have the Lacie 500G - partitioned, but with one being FAT 32 ...works fine for me.

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