Welcome to the forum.
Can you help us help you a bit better?
Please give us the full details of first your computer's OS, the version of PrE that you are using, and then the details of the file that you are having trouble Importing.
For more instructions on what info would be so very important, please see this article: http://forums.adobe.com/message/3220274#3220274
Good luck, and with more info, someone will likely be able to help you,