New DVD Writer

i have 2 removable drives, i have 1 DVD ROM and 1 CD Writer. Earlier, i removed my CD Writer and replaced it with my newly purchased DVD Writer. However, when i opened My Computer, only the floppy drive is displayed under the Devices with Removable Storage category. I tried scanning for hardware changes under device management and at the lower right screen of the taskbar, windows detected that there is a newly found hardware but it prompted me that there is a problem when installing the new hardware, your new hardware might not work properly. Then i rebooted and still i can't see my 2 DVD Roms under My Computer. I rebooted again then there is this DVD Drive E: detected, then rebooted and it's gone again, this randomly happens. Sometimes this Drive E: is detected sometimes it's not. Please do help me...