Bitcoin-Qt doesn't support BIP-0038 so you'ld need to convert the decrypt the BIP-0038 encrypted private key and then import that [edit: into your client, such as Bitcoin-Qt].  To decrypt the BIP-0038 encrypted private key click on the Wallet Details tab of BitAddress.org and enter or paste the BIP-0038 encrypted private key.  It will then prompt you for the BIP-0038 passphrase, and if it was correct the page will show the Bitcoin address and the private key (both the WIF, as well as WIF Compressed).