can't save to CD (DVD)

I currently am using a Dell Windows XP computer. I had a Compaq Presario which was giving me problems and was advised by Compaq that the motherboard was starting to fail. I did not want to purchase a new computer at the time so I installed my HD and Pioneer DVD-R/W into the Dell. It seemed to be working fine, including playing some music CD's. I then tried to Back-up my Quicken 2007 file to two different CD disks that I had been using successfully with my Compaq Presario and started getting "CD backup error!" It did successfully back-up one time.

I first disabled the Dell Hitachi DVD drive (in Device Mgr) & that made accessing my Pioneer DVD drive quicker but did not solve the problem. I then opened the computer & disconnected the two cables to the Hitachi DVD drive (I think one is called IDE & the other is Power). This did not help. I then set the jumper on the back of the Hitachi DVD drive to the middle position thinking there is a conflict between my Pioneer DVD & the original Hitachi DVD. (there are no numbers to indicate which position on either my new "Pioneer" DVD & the originalHitachi DVD. The Pioneer has 4-positions w/1 on the Rt, the Hitachi has 3-positions w/the jumper originally set to the L). I uninstalled Roxio Creator & DLA. I still cannot Back-up my Quicken file.