Lightroom 3 catalog question (newbie)

I have been using bridge but recently installed lightroom 3. I wish to make one overall catalog containing all the images in my Images folder,a large C drive folder with numerous sub-folders. I restarted LR with alt key down (PC) and specified this folder. Now LR appears to be importing the same images repeatedly. Is this normal?

No, it is not normal.
I cannot figure out how you may have achieved the effect.
But in order to savely arrive at your objective stated in your opening post, I would suggest you start all over again, like this:
Just open Lightroom normally, then go to menu File-New catalog, specify your own meaningful name (e.g. "birdgeek LR master catalog") and point to where you want the new catalog to be saved. LR will relaunch with this new catalog.
Then you can specify basic catalog settings in the menu Edit-Catalog settings.
Then you import all your images ("Add") by pointing to the root folder where all your pictures to include are stored. On a PC this might be C:\Users\[your windows user name]\Pictures.
Then leave LR alone for quite a while, depending on the number of files.
LR will leave your images where they are, but create the thumbnails inside its database and render the previews.

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