DVD Ram drive

Hi all, I have been batling DVDrw problem most of the weekend without any success so far and would really appreciate some help/advice on the matter. Here is the problem:

Bought new usb OEM DVDrw to replace my CDr/DVD in my Dell Inspiron 510, had no problem with my CDR.. the DVDr located as D:DVD ram drive in MyComputer. Everytime i insert any disk it will ejected from MyComputer (D: drive not exist). I tried install in other computer/deskop it work fine