LaCie external hard drive no longer readable after being connected to a PC

Hi all,
First post here and I really worried.
I have a Lacie external drive which I normally connect to my Mac - no problems.
Tried to connect it to my Windows 7 pc to transfer some files and it wasn't recognised. It installs the drivers and says its ready to use, but doesn't appear as a drive. So I read about it and the advice was to go to Computer Management - Disk Managment and mark drive 1 / partition as active and then assign a drive letter. So I did that and then Windows tells me that I must format the drive to use it.
Obviously I don't want to as I can't loose my data - my wedding pictures are on the drive!
So I've plugged the Lacie back into my mac, and the drive is unusable and says I need to format too. Even the repair function doesn't work.
Now I've read the another post and downloaded Test Disk (I'm working off my mac though as I know the drive worked and all my files where added from the Mac).
Its currently Anaylsing the cylinder but its taking a long time. 24hours and still on 30% (1TB drive, firewire)
I've read the help guide but once this stage completes, having read the next few steps, I'm lost.
Any ideas on what might have happened and what I need to do next?
I'll report back once its finished its 'deeper search' and analysing.
Or do I abort the above process and do something else?
Please help.
Thanks in advance,
Nick

I've read the help guide but once this stage completes, having read the next few steps, I'm lost.
And those few steps were? Care to share?
Lacie has great tech support. Call them - http://www.lacie.com/support/faq/faq.htm?faqid=10338

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LaCie external hard drive no longer readable after being connected to a PC

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