Maxtor External Hard Drive is not showing up in the My Computer.Drivers are getting loaded in device manager.Device is detected in the system tray but without the drive letter.I Dont mind formatting the External HDD but unable to do so.

Step Tried : Uninstalled and reinstalled  driver,Checked the device in different ports,checked and cleaned the virus and spyware.

Computer model : XPS 600 Desktop

OS: Windows XP Service Pack 2

Memory : 2GB

Maxtor Hard Drive : 250GB

Connectivity : USB 2.0