I have a HP CD-Writer DVD Combo 9900 series drive and although it does NOT need any type of drivers to work as say a standard CD-ROM Player/Reader or an Audio CD Player/Reader it DOES need "codecs" and a dvd software program thats compatable with your version of windows to be able to play DVD's and sorry to say it's horrible no matter how much RAM you have or how fast your CPU is it IS always a choppy film when it does play, It needs a CD-Burning program (like say roxio which sucks) to be able to burn and read cd's & cdrw's with, but from what i have found out there arent too many drivers or codecs or software or much of anything that is compatable with the HP-9900 and forget HP's help they suck too, I can never get mine to read ANY dvd's and can never get it to burn any CD-R's or RW's, even with the correct software and correct codecs installed, so I gave up after a year of searching and trying and just took the whole thing out and google searched DVD drives and bought a new DVD drive unit for $16.99 thru majorgeeks.com and it works with Media Player Classic just fine, As for the HP-9900 series well sorry to say It IS pure junk and is Completely IN-compatable with EVERY brand of DVD player (I.E. Powercinema, Media Player Classic, Cliprex, etc.), Codec and it seems HP knows there is or was a problem with the 9900series even when they sent it onto the markets a few years back and it wasnt a cheap unit new when it first came out, i think it was like $350 than gradually dropped to $90 which is when I got mine, all I can try to say to help you with is download a CD-Burning program if you can find a free one or a good inexpensive one, and DONT use windows media player's CD-Burning function cause we all know microshit stuff sucks from the get go. Good luck to you and hope you get your junk workin' !!! peace! ALSO 1 other thing, If your getting rediculous errors, try seeing if the burning program your using lets you change any configurations to allow either larger buffering or larger temp caching for when burning, also run scandisk & disc defragmenter, restart then run defrag again, and make sure you DONT have too much junk running in your toolbar when burning, crap running in your toolbar CAN and WILL affect your CD burning due to the fact that the CD Burning program is trying to use lots of RAM or disc-cashe space thats already in use by crap thats running !<:0)