|Did your friend give you the connecting cable/s too? Some 2.5" partable USB drives used a cable with 2 USB connectors to supply additional power to the drive.|
Do you know if the actual drive is IDE or SATA?
You may be able to remove the drive from the enclosure and install it internally if you have the correct type of connections.
The Gateway link below shows you have a SATA internal hard drive. Good chance you could install it internally. You have 2 free drive bays.