How to Delete Pending Purchases in iTunes
ITunes is a free program that allows you to download, play and manage music and video files. Videos and music can be purchased directly through the iTunes store. Purchases that haven't completely downloaded may be stuck in a pending state, during which time you'll be unable to delete them manually. You must take the necessary steps to report the problem and have it removed by an iTunes Support member.
Click "Start," "All Programs," "iTunes."
Click "Store" from the top menu then "Sign in" from the drop-down menu.
Click "Store" then "View My Account" from the drop-down menu.
Click the "Purchase History" button.
Click the "Report a Problem" button from the bottom of the purchase history page.
Click the arrow next to the pending purchase that you want to delete.
Click the "Report a Problem" link to the right of the pending purchase.
Click the "Problem" menu drop-down box from the "Report a Problem" page and select the option that best matches deleting a pending purchase.
Enter any necessary comments about the problem in the comment box and click the "Submit" button.
Check your email. The iTunes Store's customer support team will contact you within 24 hours.