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ok, where do I find this "Your hard drive"/Library/Receipts/iTunesX.pkg so i can delete it?

In the finder open your hard drive. In there you will see a folder named Library. Open it. Inside there are many folders: scroll down until you find the one named Receipts. Open it. Look for the file named iTunesX.pkg and delete it.

YOu can also use spotlight in tiger to locate the file.
 
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