Windows 7 64 bit upgrade from vista 64 bit. dvdrw issues...?

i recently upgraded from windows vista 64 bit to windows 7 64 bit. everything works great except my dvd burner. "my computer" shows it as a DVD RW drive. but it will not read dvds. in device manager it says the drive is a CD-ROM drive. and when i try to burn to a dvd it tells me it cant complete the burn, "make sure you have the latest firmware". i have a dell 1545 laptop. the drive label in device manager is; HL-DT-ST DVD+-RW GT10N ATA Device. ive tried microsoft fix it tool, and going to dell.com to update the driver. also when i uninstall the drive and check for hardware changes it installs the drive back as a CD-ROM. countless hours of online searching and i have found nothing useful. i did download the newest driver from dell.com and "flash the drivers" but it didn't change anything. im pretty sure all i need is a direct link to the drivers and i can figure out how to install them. no, i do not have a windows vista disc. (my dell didn't come with one).