I haven't used "seagate" external drives before but most are the same.. Do you get any or any response from the drive? I would plug the drive into another computer to make sure it works.
Here are the instructions to see if the drive is recognized by your computer.http://www.seagate.com/ww/v/index.jsp?locale=en-US&name=win2000xp-os-detect&vgnextoid=97c5bb5f5ed93110VgnVCM100000f5ee0a0aRCRD
If it is, follow the instructions to set up the drive. If it is not, the drive is probably bad and should be exchanged.