Sony DVD-RW DRU-190A

[qanda]This thread is about the Sony DRU-190A. Click here to see full specs[/qanda]2 months ago i purchased the above DVD-RW and itwas working perfectly fine for a little while. I then noticed that there was some problems with my cd drive and thought they may have been conflicting with each other so i removed the cd drive. The problems with my dvd rw still persist and i am unable to download the appropriate firmware from the sony website as keep getting errors that the files are either damaged or in an unknown format. The drive causes the system to crash regularly whether it’s in use or not. When programs crash, i have to open the drive and then i find that the system works again. Need some help getting this resolved. Also I have noticed that within the last 48 hours i’ve had over a thousand error messages in event viewer about the cd rom having a bad block. Can this be resolved or will i need to get it replaced.

Vista Home Premium SP1
2GB Crucial ram
300GB Maxtor HDD
80GB Seagate HDD
MSI K9N6PGM2 mobo
Athlon 64X2 4200+ processor
GeForce 9400GT graphics card
Sony DRU-190A DVD-RW drive