( I got a new sonys dvd rewritable drive, and the store guy said that they are giveing it from the stocks(it was not in any box or anything,just the drive, i am really worried about that) ..... so when i installed it , it read cds , but when i inserted a blank dvd , nothing happend and when opened my computer there was no dvd drive - the label was "cd drive" now and "f:/ is not accessible ". then i insterted the OEM suit cd i got with it , , same thing nothing happened . PLEASE HELP ME , PLEASE (