You not need a driver for your DVD840i lightscribe DVD burner, Windows have the DVD driver already.
What you need is a software like Surething Deluxe plus the lightscribe program to active the lightscribe feature, you can go to this web site and download free the lightscribe software.
http://www.lightscribe.com/downloadSection/index.aspx
Remember, this program is for active the lightscribe feature, you still to have the program like Surething or NERO to work with it.
I hope this help, God bless
Enrique (Quiquichu)