OK, awesome. This means that your computer can see the drive. That's good.
I will try to keep it as short and simple as possible.
In computer management, when you click on disk management, you should see C and D drive. You should also see CD Rom listed with a letter next to it. Probably E:. Note the last letter listed here in the right side, bottom frame.
Right off the top of my head, I am not certain the listing that will show on the left side to indicate the Lacie drive. BUT, you should be able to take note the size of the Lacie drive and compare it to the used/available combined total space. It should be close. For example, 160GB drive after formatting, will show 148GB available. Approximately, 10%.
To the right of the Disk 0, (***Be sure that this is
not the C: drive****) in the blank white space, right click and select change drive letter and paths. Click
add to add a drive letter (this assumes that there is nothing listed in the box). Select
add the following drive letter and select a letter. Choose something high in the alphabet as a test. Something after K for example. Click OK and OK. The drive letter should assign itself to the Lacie drive and be visible in My Computer.
*Edit: Short, it was not.