Everything worked fine for 2 months with my NEC 3520A burner even with the mod firmware from Liggy & Dee's. Then all of a sudden, Windows XP cannot find my device anywhere. I tried uninstalling and re-installing the driver. I tried updating the driver. I searched for the OEM driver on NEC.com site. Still having problem. Can someone help me solve this problem, or is this a case of a product gone bad and that I need to RMA this thing. Thanks!